Structure Contour Map on the Precambrian Unconformity Surface in Ohio and Related Basement Features

Transcription

1 Structure Contour Map on the Precambrian nconformity Surface in Ohio and Related Basement Features by Mark T. Baranoski igital Map Series PG-23, Version 2. STATE OF OHIO EPARTMENT OF NATRAL RESORCES IVISION OF GEOLOGICAL SRVEY Thomas J. Serenko, Chief Columbus 23

2 ISCLAIMER ata used in this report and map is subject to reporting errors, sample cutting lag times, borehole irregularities, faulty instrumentation, inadequate rathole, rounding errors, hearsay, and other factors beyond the control of the author. RECOMMENE BIBLIOGRAPHIC CITATION Baranoksi, M.T., 23, Structure contour map on the Precambrian unconformity surface in Ohio and related basement features (ver. 2.): Columbus, Ohio epartment of Natural Resources, ivision of Geological Survey Map PG-23, scale :5,, 7 p. text.

3 CONTENTS Introduction... pdates to map PG Acknowledgments... 2 References cited... 2 TABLES. Regional structural features in the Precambrian basement of Ohio as depicted on map PG Well data for control points on map PG Seismic reflection profiles on map PG iii

4 INTENTIONALLY BLANK

5 Structure Contour Map on the Precambrian nconformity Surface in Ohio and Related Basement Features, Version 2. by Mark T. Baranoski INTROCTION Additional deep well drilling to the Precambrian basement in the Ohio region has necessitated revision of map PG-23 (Baranoski, 22), to which the reader is referred for the history and methodology of the map s development. Table herein lists structural features and bibliographic citations, replacing Appendix A from Baranoski (22). Tables 2 and 3 list well data and seismic reflection lines, respectively, and replace Appendices B and C from Baranoski (22). The updated map uses and identifies 79 additional wells for mapping Ohio, the surrounding states, and Ontario, Canada, and also 47 additional paleotopographic high areas and monadnocks. The new map uses insets to show detail where required and also indicates Class II oil-field waste injection wells in addition to Class I industrial-waste injection wells. Since 22, the major impetus for drilling deep wells has been an increased interest in oil-field brine disposal, research for CO 2 sequestration targets, and wildcats. Cambrian-age rocks cannot be properly evaluated for disposal zones, sequestration targets, or hydrocarbon potential unless a well is drilled into the Precambrian complex with sufficient depth (including a rathole 2 ). Typically, feet (ft) of rathole into the Precambrian will allow open-hole geophysical instruments to collect data along the uppermost Precambrian and the entire Cambrian interval for proper evaluation. Also since the 22 map was released, new analyses of diamond bit core have revealed that Ohio s Precambrian rocks are significantly older than previously thought. While the details of age-dating results are not included in this report, The informal term Precambrian has become obsolete with the advent of modern radiometric age dating of rocks. The preferred term for rocks beneath the Cambrian is Proterozoic Eon (Ohio Geological Survey, 99; Palaeos, [n.d.]). The Proterozoic is subdivided into three eras, which in ascending order are Paleoproterozoic, Mesoproterozoic, and Neoproterozoic. However, this report will continue to use the informal term Precambrian. 2 Extra hole drilled at the end of the well (beyond the last zone of interest) to ensure that the zone of interest can be fully evaluated. The logging tool string may be as much as 2 ft (36.5 m) in length, so the rathole allows tools at the top of the logging string to reach and measure the deepest zone of interest. (Schlumberger, 23) these older rock ages will have far-reaching effects on our understanding of the Precambrian complex underpinning the Ohio region. Both deep well drilling and age-dating research will assist industry and academia in developing new tectonic models for the Ohio region. For more than one half century there has been little change to Bass s (96) original delineation of Ohio s Precambrian Provinces using geochronology: older, unmetamorphosed Granite-Rhyolite Province rocks west of a north south boundary of younger, metamorphosed Grenville Province rocks (see Baranoski and others, 29). Bass (96) noted the presence of unmetamorphosed sedimentary rocks west of the Grenville Province boundary in the Mattinson well (API number ) in Clark County. It was not until the discovery of the Middle Run Formation (Shrake and others, 99) followed by reexamination of older well data, new well drilling, and seismic reflection data that revealed extensive and thick, unmetamorphosed sedimentary rocks. rahovzal and others (992) interpreted these newly discovered rocks beneath the Paleozoic as deposits of the regional Precambrian East Continent Rift System. The generally accepted ages of these provinces are.3 to.4 billion years (Ga) for the Eastern Granite-Rhyolite Province of western Ohio (Van Schmus and others, 996);. to.2 Ga for the Grenville Province (Culshaw and ostal, 22); and.+ Ga for the East Continent Rift System (Santos and others, 22). However, these well-established rubidium-strontium (Rb-Sr) radiometric age dates have likely been reset due to later tectonic events applied to older crustal rocks now known to exist in Ohio (Petersson and others, 22). Another significant and yet unexplained tectonic anomaly to Bass s (96) original Ohio Precambrian Province delineation line is the gabbro in Seneca County, Ohio (API number , GS core no. 8; see Wickstrom and others, 985). This well was drilled approximately 3 miles east of the Grenville boundary into Lucius and von Frese s (988) Seneca geopotential anomaly. The gabbro was analyzed for samariumneodymium (Sm-Nd), yielding a radiometric age date of.3 Ga and a calculated (time of crystallization of depleted mantle [TM]) model age date of.6 Ga (Van Schmus and

6 2 Baranoski others, 996). Interestingly this gabbro did not exhibit deformation, metamorphism, or radiometric resetting even though located well within the Grenville Province. Van Schmus and others (996, p. 23) explained this anomaly as a block of crust that locally escaped penetrative deformation. Their calculated (TM) model age date of.6 Ga for the gabbro was the first indication, at least locally, of Ohio crust much older than the Eastern Granite-Rhyolite. These findings further added to the unexplained tectonic history of the region. In 22, uranium-lead (-Pb) radiometric age-dating of zircon crystals was performed on six Ohio diamond drill core in Sweden by r. Jenny Andersson (Jenny Andersson, unpub. data, 22; Baranoski and others, 22). This work was later expanded upon by Petersson (2) to show that Ohio s crustal complex is at least.6 Ga in age (Petersson and others, 22). These new preliminary age dates are more than 2 million years older than previous dates for the Eastern Granite-Rhyolite Province and allow extension of the Van Schmus and others (996) older crust over most of Ohio. These findings will spur work to develop new crustal models for the Ohio region and will change the way we currently view the Granite-Rhyolite and Grenville Provinces and the East Continent Rift Basin. Such new tectonic models will likely change our view on the region s Paleozoic structural and stratigraphic history. Long-term implications of new models will affect future exploration and development of energy, mineral, and geothermal resources; industrial-waste and oil-field brine disposal; CO 2 sequestration; and seismicity research. PATES TO MAP PG-23 The revised PG-23 map utilizes data from 335 wells drilled into Precambrian basement 3, including an additional 8 wells since the 22 map was published. Of those additional wells, 43 are in Ohio and include new information for 3 older wells and 3 new wells drilled since 22. Of the 3 new wells since 22, 6 are permitted as oil-field waste injection wells into Cambrianage reservoirs; 2 are rank wildcat; and 2 were drilled for CO 2 sequestration research. Eight Ohio counties have had drilling to the Precambrian for the first time since the 22 map was published 4. The remaining 37 additional 3 A total of wells have a question mark () associated with () formation name and total depth and (2) the subsea value on the PG-23 map. These wells have not been verified conclusively with sample cuttings or geophysical well logs. In most cases, samples were not available and in some instances samples were too fine in size to analyze without grain mounts and a high-power petrographic microscope. The avid Hill Georgetown-Marine well in Belmont County is the deepest well drilled in the state at 3,727 ft. This well is interpreted as reaching near the base of the Cambrian Conasauga Formation and a few tens to a couple of hundred feet above the Precambrian basement, thus justifying this well location as an important control point in a sparsely drilled region. 4 Belmont, Carroll, Fairfield, Greene, Mahoning, Stark, Trumbull, and Tuscarawas Counties. wells include new wells drilled outside of Ohio and into an expanded map area, which added older wells. One well each in Indiana, Kentucky, and West Virginia was drilled to the Precambrian for CO 2 sequestration research since 22. The updated map also shows wells drilled to the Precambrian that have been permitted (active and inactive) for Class I industrial-waste injection (2 wells) and Class II oil-field waste injection (26 wells). Table 2 lists all the wells on the map, with additional wells since 22 footnoted. Sixteen Ohio counties have not yet had a well drilled into the Precambrian: Athens, Belmont, arke, Champaign, Gallia, Geauga (see observation below), Hamilton, Jefferson, Meigs, Montgomery, Monroe, Morgan, Ottawa, Preble, Vinton, and Washington. A Geauga County well (API number ) reportedly had been drilled to a total depth of 7,77 ft with tools lost in the hole. This well was drilled along the Akron Magnetic Boundary trend and yields a subsea value of 5,877 ft, which lies proximal to contours interpreted for the revised map, suggesting the total depth of the well was close to the Precambrian. This well location was not used on the revised map without further documentation, electric well logs, and/or sample cuttings. Seismic-reflection lines, fault codes, and fault positions remain unchanged from the 22 map. However, one relative fault movement was changed to p on the southwest for the Harlem Fault in southeastern elaware County. This change suggests steep vertical northeast dip on the fault. The structural features table (table ) now recognizes the Serpent Mound impact structure of southern Ohio and includes the tica Mountain Structure and Fault in Licking and Knox Counties. The original 7 paleotopographic high areas or monadnocks on the 22 map included only those wells where Janssens (973) Cambrian Mount Simon Sandstone was not present above the Precambrian. The updated 23 map has 67 symbols for well locations drilled into paleotopographic high areas 5 more than on the 22 map. The paleotopographic high areas on the updated map include both additional wells missing Janssens (973) Mount Simon and other wells with relatively thin basal Cambrian units (Baranoski, unpub. data, 23). Two additional paleotopographic high areas outside of Ohio are located in Branch County, Michigan, and Erie County, Pennsylvania. Contour lines were adjusted digitally/manually using Geographix mapping software, following placement of new Precambrian well locations and subsea values. Finalized shape files were exported from Geographix and reformatted in Esri ArcMAP. The final version of the map includes brief text and updated data tables and is formatted as an Adobe PF file. Also included with the revised map is a database of well data, seismic line locations, faults, contours, and metadata. Metadata is described in the digital V version of this report.

7 Structure Contour Map on the Precambrian nconformity Surface 3 TABLE. Regional structural features in the Precambrian basement of Ohio as depicted on map PG-23 Type of structure Map number Named feature References anomaly 47 Seneca Anomaly Lucius and von Frese, Southwestern Ohio Anomaly Lucius and von Frese, 988 cross-strike structural discontinuity (CSS) 3 Cambridge CSS Shumaker, 986; Coogan and Reeve, 985; Baranoski, 989, 99, 993a, 993b, 993c; Riley and others, 993; Root, 996 Pittsburgh-Washington CSS Harper and Laughrey, 987; Riley and others, 993 fault 27 Akron Fault Gray and others, 982; Root and MacWilliams, 986; Shumaker, 986; Coogan, 99; Riley and others, Anna-Champaign Fault McGuire, 975; Schwartz and Christensen, 986; Wickstrom, 99; Wickstrom and others, Auglaize Fault Schwartz and Christensen, 986; Wickstrom, 99; Wickstrom and others, Bellefontaine Outlier Faults Steck, 997; portion of nion Fault from Wickstrom, 99 8 Bowling Green Fault System Orton, 888; Carman and Stout, 934; Stout, 94; Green, 957; Worthing, 965; Janssens, 973; Shearrow, 987; VanWagner, 988; Wickstrom, 99; Wickstrom and others, 992; Onasch, Burning Springs Fault System Shumaker and others, 982; Calvert, 983; Shumaker, 986; Baranoski, Crawford Faults Wickstrom, 99; Wickstrom and others, Harlem Fault Wickstrom, 99 3 Highlandtown Fault Gray and others, 982; Root and MacWilliams, 986; Shumaker, 986; Coogan, 99; Riley and others, Kentucky River Fault System McGuire and Howell, 963; Rudman and others, 965; Lidiak and Zietz, 976; Ammerman and Keller, 979; Webb, 98; Black and others, 98; Cable and Beardsley, 984; Black, 986; Harris and rahovzal, 996; rahovzal and Noger, 995; Stark, Killbuck ome Wicks, Logan Fault McGuire, Marion Fault Wickstrom, 99; Wickstrom and others, 992; Shrake, Maumee Fault Wickstrom, 99 Middleburg Fault Gray and others, 982; Root and MacWilliams, 986; Coogan, 99 7 Ohio River Fault Calvert, 974; Baranoski and Riley, Outlet Fault Wickstrom, 99; Shrake, Plum Run Quarry Fault Schmidt and others, 96; Reidel and Koucky, 98; Reidel and others, 982; Baranoski and others, 23 2 Rome Trough Fault System Lockett, 947; Thomas, 96; Woodward, 96; McGuire and Howell, 963; Rudman and others, 965; Webb, 969, 98; Silberman, 972; Heyl, 972; Harris, 975; Wagner, 976; Shumaker and others, 982; Beardsley and Cable, 983; Cable and Beardsley, 984; Keller and others, 983; Baranoski, 993b; Kulander and ean, 986; Harper, 989; Coogan and Peng, 993; Riley and others, 993; Harris and rahovzal, 996; Stark, Smith Township Fault Gray and others, 982; Root and MacWilliams, 986; Coogan, 99; Riley and others, 993; Shumaker, Starr Fault System Brannock, Suffield Fault System Gray and others, 982; Root and MacWilliams, 986; Coogan, 99; Riley and others, 993; Shumaker, Tiffin Fault Sitler and Wehmeyer, 962; Shearrow, tica Mountain Fault this report 42 unnamed faults (Adams Co.) Foerste and Lamborn, unpub. data, 98, 99; Harper, 939; Bucher, 92, 933, 935, 936, 963; Galbraith, 968; Galbraith and Koucky, 969; Reidel, 972, 975; Koucky, 975; Reidel and Koucky, 98; Reidel and others, unnamed fault (Ashtabula Co.) this report 45 unnamed fault (Ashtabula Co.) Seeber and Armbruster, unnamed fault (Belmont Co.) Berryhill, unnamed faults (elaware Co.) Galey, unpub. data, 964; Rudman and others, 965; Swinford and Slucher, unnamed faults (Fayette Co.) Mayhew, unnamed faults (Fayette, Ross, Pickaway Cos.) 8 unnamed fault (Hancock Co.) Shearrow, unnamed fault (Highland Co.) Shearrow, 987 Mayhew, 969; Shearrow, 987

8 4 Baranoski TABLE. Regional structural features in the Precambrian basement of Ohio as depicted on map PG-23 (cont.) Type of structure Map number Named feature References unnamed fault (Lake Co.) Nicholson and others, 988 fault (cont.) 4 unnamed faults (Madison Co.) Mayhew, unnamed fault (Sandusky Co.) this report 5 unnamed fault (Scioto Co.) this report 23 unnamed fault (Seneca Co.) Shearrow, unnamed fault (Warren Co.) Shrake and others, 99 3 unnamed faults (Washington Co.) Baranoski, 989; eyling, unnamed fault (Wyandot Co.) this report unnamed faults along COCORP ean and others, 998; this report seismic lines 5 W. Hickman Creek-Bryan Station Fault Harper, 939; McGuire and Howell, 963; Worthing, 965; Galbraith, 968; Lidiak and Zietz, 976; Ammerman and Keller, 979; Patterson, 98; Webb, 98; Black and others, 98; Swinford, 983; Harper, 989; Black, 986; Hinze and others, 987 miscellaneous structure 46 Akron Magnetic Boundary Aggarwal, 987; Seeber and Armbruster, Serpent Mound impact structure Locke, 838; Orton, 87; Foerste and Lamborn, unpub. data, 98, 99; Harper, 939; Bucher, 92, 933, 935, 936, 963; Stout, 94; Lockett, 947; Schmidt and others, 96; Sappenfield, 95, 95; Summerson and others, 963; Worthing, 965; Bull and others, 967; Galbraith, 968; Galbraith and Koucky, 969; Reidel, 972, 975; Koucky, 975; Reidel and Koucky, 98; Reidel and others,982; Langford, 984; Koucky and Reidel, 987; Baranoski, 993c; Baranoski and others, Coshocton Zone Pratt and others, 989; Culotta and others, Fort Wayne Rift enison and others, 984; Hinze and others, 987; Lucius and von Frese, 988; Coogan and Peng, tica Mountain Structure this report province Granite-Rhyolite Province Bass, 96; enison and others, 984; Bickford and others, 986; Lucius and von (Central Granite-Rhyolite Province/ Frese, 988; Pratt and others, 989; Culotta and others, 99; rahovzal and Eastern Granite-Rhyolite Province) others, 992; Hauser, 993 Grenville Province Bass, 96; Rudman and others, 965; Webb, 98; Black and others, 98; Keller and others, 983; Beardsley and Cable, 983; Bickford and others, 986; Black, 986; Lucius and von Frese, 988; Green and others, 988; Pratt and others, 989; Culotta and others, 99; Hoehn, 99; Hoehn and Hinze, 992; Coogan and Peng, 993; Hauser, 993; Riley and others, 993; Carter and others, Grenville Front Tectonic Zone McGuire and Howell, 963; Rudman and others, 965; Bayley and Muehlberger, 968; Mayhew, 969; Lidiak and Zietz, 976; Hinze and others, 987; Lucius and von Frese, 988; Pratt and others, 989; Culotta and others, 99; Hoehn, 99; Hoehn and Hinze, 992; Coogan and Peng, 993; Hauser, 993; Lidiak and Hinze, 993; Wolfe and others,993; Riley and others, 993; Richard and Wolfe, 995; Stark, 997; Steck, 997 East Continent Rift Basin Shrake and others, 99; rahovzal and others, 992; Riley and others, 993; Wolfe and others, 993; Coogan and Peng, 993 East-central midcontinent rift system McGuire and Howell, 963; Lidiak and Zietz, 976; Halls, 978; Keller and others, 982, 983; Cable and Beardsley, 984; Hinze and others, 987; Hoehn, 99; Hoehn and Hinze, 992; Stark, 997 Kentucky-Ohio Trough Black, 986

9 Structure Contour Map on the Precambrian nconformity Surface 5 TABLE 2. Well data for control points on map PG-23 Precambrian-top data source: C = core; = driller; E = electric-log interpretation; N = no sample cuttings; S = sample-cuttings interpretation, by Baranoski unless otherwise noted nique well County Lease name Well no. Company name number Well total depth Formation at total depth atum well elevation above sea level Along-hole depth to top of Precambrian Precambrian-top data source OHIO 3424 Adams Bailey -A Cabot Corp. 3,79 Precambrian 74 3,778 E -3,64 34 Adams Covert Commonwealth Gas Corp. 3,829 Precambrian 624 3,87 E -3, Adams Russell-Tener Oxford Oil Co. 3,886 Precambrian 852 3,865 S, E -3, Allen Pohlman H. & H. Producing Co. 3,27 Middle Run Formation 87 3,27 N, E (Warner, 988) -2, Allen Pohlman et al. nit 3 Alco Oil Co. 3,265 Precambrian 8 3,28 N, E (Warner, 988) -2, Allen BP Chemical BP Chemical 3,33 Middle Run Formation 872 3,33 E (Warner, 988) -2, Allen BP Chemical 2 BP Chemical 3,7 Middle Run Formation 853 3,43 E (Warner, 988) -2, Allen BP Chemical 3 BP Chemical 3,7 Middle Run Formation 856 3,38 E -2, Allen BP Chemical 4 BP Chemical 3,3 Middle Run Formation 874 3,53 C, E -2, Ashland Fingulin Bass Energy Co. 5,63 Precambrian,83 5,6-3, Ashtabula Rhoa -H Horizon Oil 6,75 Precambrian 983 6,74 S (Owens, 967) -5, Ashtabula Brayman East Ohio Gas Co. 6,97 Precambrian 977 6,898 S, (Gonterman, 973) -5, Ashtabula Roulston.S. Gas & Oil 6,659 Precambrian 86 6,66 S, -5, Ashtabula Rhoa 3 POI Energy 7,36 Precambrian 95 7,2 N, -6, Ashtabula Parobek 2 POI Energy 7,27 Precambrian 942 7,6 N, E (Warner, 988) -6, Ashtabula Lautanen POI Energy 7,5 Precambrian 973 7,2 N, -6, Ashtabula ietrich niversal Energy 7,8 Precambrian 932 6,776 N, E (Riley and others, 993) -5, Ashtabula Bustamante 2 Bottom Line Prod. 7,74 Precambrian 969 6,92 N, -5, Ashtabula Krcal nit CGAS Exploration 6,9 Precambrian 848 6,237 E -5, Ashtabula Monroe Kastle Resources 7,6 Precambrian 99 6,856 N, E -5, Ashtabula Reserve Environmental Services Reserve Environmental Services 6,6 Precambrian 65 5,972-5, Auglaize Hoelscher Comm. West Ohio Oil & Gas 3,67 Precambrian 896 2,942 S (Janssens, 973) -2, Auglaize Elshoff 2 Innex Oil and Gas, Inc. 3,75 Middle Run Formation 87 3,9 S, E -2, ,3 Belmont Georgetown Marine avid R. Hill Inc. 3,727 Cambrian Conasauga Formation,29 3,727 S, E, estimated -2, Brown Griffith Spencer Petroleum 3,35 Middle Run Formation 946 3,26 S, E -2, Butler Armco Steel Corp. Armco Steel Corp. 3,297 Middle Run Formation 666 3,239 E -2, Butler Armco Steel Corp. 2 Armco Steel Corp. 3,285 Middle Run Formation 67 3,233 E -2, Carroll Lee nit - Range Resources 8,922 Precambrian 964 8,85 S, E -7, Clark Brown Edmund Oil & Gas 3,649 Precambrian,249 3,624 S (Owens, 967) -2, Clark Elcamere Farms Hodges Industries 3,578 Precambrian,67 3,55 E -2, Clark Mattison Friend 4,647 Precambrian,87 3,385 S -2, Clermont Wikoff Continental Oil Co. 3,436 Precambrian 87 3,328 S, E -2, Clinton Adams Kewanee Oil Co. 3,392 Precambrian,8 3,372 E -2, Clinton Van Pelt Kewanee Oil Co. 3,263 Precambrian,92 3,3 S, E -2, Clinton McVey Kewanee Oil Co. 3,473 Precambrian,87 3,46 S (Janssens, 973) -2, Clinton Coy Stocker & Sitler 3,63 Precambrian,98 3,554 S, E -2, Columbiana Murray 3 Management Control Corp.,242 Precambrian,94,2-9, Coshocton Lee Tatum 6,97 Precambrian,4 6,96 S -5, Coshocton Columbus & Southern Ohio Electric C Worthington Oil 7,585 Precambrian 879 7,55 N, -6, Coshocton Burrell Pomstone 7,363 Precambrian 852 7,296 N, -6, Coshocton Adams Preferred Fluids Mgt., LLC 7,35 Precambrian 787 7,29 S, E -6, Crawford Spitler-Brown nit Piggott 3,45 Precambrian 977 3,4 N, E (Owens, 967) -2, Crawford Leonhardt Luling Oil & Gas Co. 3,774 Precambrian,8 3,77 S (Owens, 967) -2,762 Precambrian subsea value American Petroleum Institute -digit numbers are used for wells in the following states: Ohio, Kentucky, Michigan, Pennsylvania, and West Virginia. 2 Well added after Well did not penetrate the Precambrian.

10 6 Baranoski TABLE 2. Well data for control points on map PG-23 (cont.) Precambrian-top data source: C = core; = driller; E = electric-log interpretation; N = no sample cuttings; S = sample-cuttings interpretation, by Baranoski unless otherwise noted nique well County Lease name Well no. Company name number Well total depth Formation at total depth Cuyahoga Jones & Laughlin Steel Corp. Jones & Laughlin Steel 5,8 Precambrian 63 5,77 S, E -5, Cuyahoga Marconi Medical Systems Bass Energy Co. 6,55 Precambrian 974 6,54 S -5, efiance Haver Brown 3,6 Precambrian 72 3,62 E -2, elaware Vance Chester Wise et al. 4,29 Precambrian 92 3,845 S (Owens, 967) -2, elaware Sprain Wehmeyer 4,6 Precambrian 988 4, E -3, elaware Jones Southern Triangle 3,426 Precambrian 945 3,42 (Janssens, 973) -2, elaware Smith McClure Oil Co. 4,35 Precambrian 992 3,99 S (Owens, 967) -2, elaware Lindsey Minnesota-Ohio Oil Co. 4,7 Precambrian 99 4,58 E -3, elaware Gregory Minnesota-Ohio Oil Co. 4,685 Precambrian, 4,685 S (Owens, 967) -3, elaware Jolliff Funk Exploration 3,382 Precambrian 933 3,352 N, E -2, elaware Case Funk Exploration 3,569 Precambrian 99 3,554 S, -2, elaware Morrison J-4 Sunbury-Trenton Inc. 4,6 Precambrian,9 4,6 S -3, elaware Cockrell-Godshall nit Poling Co. 4,873 Precambrian,8 4,45 S, E -3, elaware Sheets NGO evelopment Corp. 4,3 Precambrian 987 3,956 E -2, elaware Longshore et al. nit Poling Co. 4,272 Precambrian,7 4,66 E -3, Erie Sayler et al. Ohio Fuel Gas Co. 4,47 Precambrian 87 4,4 S (Summerson, 962) -3, Erie Krysik-Wakefield et al. nit Sun Oil Co. 4,463 Precambrian 828 4,455 S (Owens, 967) -3, Erie Herman et al. Sun Oil Co. 4,466 Precambrian 829 4,449 E (Janssens, 973) -3, Erie Nixon nit Bartlo Oil and Gas 3,65 Precambrian 7 3,64 N, E -2, Erie Kellstone Kellstone 3,436 Precambrian 6 3,375 S, E -2, Fairfield Harden nit MFC rilling, Inc. 5,8 Precambrian,97 5,56 E -3, Fayette Hopkins Kewanee Oil Co. 4,78 Precambrian 965 3,545 S (Summerson, 962) -2, Fayette Wilson Kewanee Oil Co. 3,494 Precambrian,7 3,342 S (Summerson, 962) -2, Fayette Barnes Kewanee Oil Co. 3,4 Precambrian,44 3,332 S, E (Janssens, 973) -2, Fayette Cockrill Barnwell Producing 3,64 Precambrian,2 3,636 E -2, Fayette Hanawalt Oxford Oil Co. 3,375 Precambrian 97 3,542 E -2, Fayette Braun Oxford Oil Co. 3,75 Precambrian 98 3,732 E (Riley and others, 993) -2, Fayette uff Stocker & Sitler 3,352 Precambrian 946 3,23-2, Franklin Marble Cliff Quarries Marble Cliff Quarries 3,622 Precambrian 697 3,67 S (Owens, 967) -2, Fulton Storeholder Liberty Petroleum Corp. 3,7 Precambrian 689 3,555 S -2, Greene Greene Tatum Petroleum Co., LLC 3,343 Precambrian,79 2,948 S -, Guernsey Marshall Comm. Lake Shore Pipeline Co. 8,622 Precambrian,7 8,355 E (Riley and others, 993) -7, Guernsey evco nit avid R. Hill Inc. 8,9 Precambrian,8 8,8 S, E -7, Guernsey Mitchell avid R. Hill Inc. 8,856 Precambrian,4 8,82-7, Guernsey SOS- Silcor Oilfield Services, Inc. 8,9 Precambrian 89 8,89 S, E -8, Hancock Frazier ever 3,7 Middle Run Formation 824 3,8 S (Janssens, 973) -2, Hancock Harris Cowen 2,799 Precambrian 833 2,795 S (Janssens, 973) -, Hancock rummelsmith Kin-Ark Oil Co. 2,87 Precambrian 89 2,795 S (Janssens, 973) -, Hancock Norris Fennerty et al. 2,98 Precambrian 83 2,77 S (Summerson,962) -, Hardin Jones Edmund 2,834 Precambrian 94 2,84 S (Janssens, 973) estimated -, Hardin Wolf McMahon-Bullington rilling 2,992 Precambrian 97 2,96 E (Warner, 988) -, Hardin Fewell - Ensign Operating Co. 2,928 Precambrian 934 2,867 E -, Harrison Zechman nit Red Hill evelopment,6 Precambrian 898,474 N, E -9, Henry Hall Callander & Kimbrel 3,475 Precambrian 683 3,4 E -2, Henry Shidler 3-4SW Aurora Energy, Ltd. 3,375 Precambrian 692 3,355 S, E -2, Highland Pavey Kewanee Oil Co. 3,52 Precambrian,43 3,55 S (Janssens, 973) estimated -2, Highland Courtney Ohio Valley Oil & Gas Co. 3,6 Precambrian 957 3,582 E (Gonterman, 973) -2,6 atum well elevation above sea level Along-hole depth to top of Precambrian Precambrian-top data source Precambrian subsea value

11 Structure Contour Map on the Precambrian nconformity Surface Highland Carl-Roberts nit J- Oxford Oil Co. 3,442 Precambrian,4 3,38, E -2, Highland Heyob-Coyne-West nit J- Oxford Oil Co. 3,299 Precambrian,5 3,45 E -2, Hocking Hockman unigan 6,495 Precambrian 97 6,469 S (Owens, 967) -5, Holmes Killbuck Test Well OOGC isposal Co. 6,532 Precambrian 8 6,52 E -5, Holmes Snyder Bakerwell, Inc. 5,988 Precambrian 875 5,93 N, -5, Holmes Hawkins nit -H Bakerwell, Inc. 6,686 Precambrian 8 6,662 N, E -5, Holmes Snyder nit 2-59 Bakerwell, Inc. 6,396 Precambrian 88 6,394 E -5, Holmes Kaser-Rohr nit -238 Bakerwell, Inc. 6,324 Precambrian 8 6,32 N, E -5, Huron Arting White 4,27 Precambrian 749 3,9 S (Summerson, 962) -3, Huron Wolf nit Appalachian Exploration 4,574 Precambrian 856 4,554 N, -3, Huron Walcher-Gray 2 NGO evelopment Corp. 4,445 Precambrian 97 4,34 N, -3, Jackson Wood Worthington Oil 6,32 Precambrian 86 6,28 S (Owens, 967) -5, Jackson Slavens Halbert 5,68 Precambrian 665 5,575 S (Owens, 967) -4, Jackson Brown Halbert 5,99 Precambrian 84 5,99 (Owens, 967) -5, Jackson Trepanier Nucorp Energy Corp. 6,5 Precambrian 834 5,965 S, E -5, Knox Cunningham KST Oil & Gas 5,745 Precambrian,239 5,74 E -4, Knox Larimore Ohio Fuel Gas Co. 5,376 Precambrian,24 5,364 S (Janssens, 973) -4, Knox Huffman Kin-Ark Oil Co. 4,97 Precambrian,83 4,773 S (Janssens, 973) -3, Knox onaldson Edco rilling & Producing 5,354 Precambrian,86 5,235 N, E -4, Knox Carter G-M B. & J. rilling Co. 5,84 Precambrian,32 4,98 E -3, Knox White Cobra Oil & Gas Co. 5,23 Precambrian,22 4,99 N, -3, Knox Parkinson 4 Michigan Geosearch 4,92 Precambrian,6 4,92 N, E -3, Knox Parkinson 6 Michigan Geosearch 4,886 Precambrian,28 4,853 N, E -3, Knox McCoy Knox Energy, Inc. 5,26 Precambrian,2 5,2 S, E -4, Knox Ernest 2 Redman Oil Co. 5,234 Precambrian, 5,66 N, E -4, Lake Calhio Chemicals Calhio Chemicals 6,72 Precambrian 7 6,6-5, Lake Calhio Chemicals 2 Calhio Chemicals 6, Precambrian 72 6,96 N, -5, Lake iamond Alkali Co. LM Environmental Brine Services 5,975 Precambrian 623 5,923-5, Lake Vrooman Great Plains Exploration 6,355 Precambrian 88 6,38 S, E -5, Lake ickey 3 Great Plains Exploration 6,3 Precambrian 794 6,295 E -5, Lawrence Payne Goldberg 7,2 Precambrian 69 6,95 N, E -6, Licking Crowley Lake Shore Pipeline Co. 5,99 Precambrian,6 5,978 S (Owens, 967) -4, Licking Roberts Atha 4,952 Precambrian,79 4,9 S (Owens, 967) -3, Licking Schmelzer Ashland Oil & Refining Co. 4,82 Precambrian,9 4,785 S (Owens, 967) -3, Licking Moran Moran 6,237 Precambrian 86 6,25 N, -5, Licking ispennette alton & Hanna Co. 5,5 Precambrian,9 4,8 E, S -3, Licking hde 3-9 Michigan Geosearch 4,922 Precambrian, 4,838 E -3, Licking Ellas nit Clinton Oil Co. 5,626 Precambrian,222 5,62 S, E -4, Licking ager Knox Energy, Inc. 4,962 Precambrian 96 4,95 S, E -3, Logan Johns et al. nit Ohio Oil Co. 3,36 Precambrian,9 3,5 S (Summerson, 962) -2, Logan Prinkey nit Ashtola Exploration Co. 3,26 Precambrian, 3,4 S, E, -2, Lorain Born East Ohio Gas Co. 4,59 Precambrian 85 4,573 S (Owens, 967) -3, Lucas Ketring nit Liberty Petroleum Corp. 3,94 Precambrian 674 3,624-2, Madison Hume Amerada Petroleum Corp. 3,63 Precambrian 995 3,6 S (Janssens, 973) -2, Madison Immell Columbia Natural Resources 3,476 Precambrian,6 3,476 Estimated -2, Mahoning Northstar & L Energy, Inc. 9,92 Precambrian 877 8,992 S, E -8, Mahoning Northstar Khalil 3 Northstar #3, LLC 9,58 Precambrian,52 9,5 E -8, Mahoning Northstar Lucky 4 & L Energy, Inc.,88 Precambrian,26 9,99 E -8, Mahoning Northstar Collins 6 & L Energy, Inc. 9,84 Precambrian,49 9,764 E -8, Marion Mitchell nited Producing 3,675 Precambrian, 3,665 S (Owens, 967) -2, Marion Parrish Stadler & Mattix 2,984 Precambrian 98 2,985 N, -2, Marion McNamara 6 X-Alpha International 3,657 Precambrian 965 3,63 N, -2, Marion Herr elray Oil 2,934 Precambrian 95 2,924-2,9

12 8 Baranoski TABLE 2. Well data for control points on map PG-23 (cont.) Precambrian-top data source: C = core; = driller; E = electric-log interpretation; N = no sample cuttings; S = sample-cuttings interpretation, by Baranoski unless otherwise noted nique well County Lease name Well no. Company name number Well total depth Formation at total depth Marion Gracely Farms Anschutz Corp. 3,74 Precambrian 926 3,6 E -2, Marion Oehler Texas Gas Exploration Corp. 2,99 Precambrian 974 2,938, E -, Marion Gracely Farms Texas Gas Exploration Corp. 3,98 Precambrian 96 3,2 E -2, Marion Wenig et al. elray Oil 2,935 Precambrian 99 2,99 N, E -2, Marion Gracely Farms Texas Gas Exploration Corp. 3,75 Precambrian 924 3,62 E -2, Marion Forry et al. OH-377 Equitable Resources 3,42 Precambrian 93 3,92 N, E -2, Medina Smith -A Wiser Oil Co. 7,4 Precambrian,2 6,58 S (Janssens, 973) -5, Medina Warner Wiser Oil Co. 6,73 Precambrian,6 6,662 S, E (Janssens, 973) -5, Medina Wandel nit Moore 5,667 Precambrian,92 5,65 E (Warner, 988) -4, Mercer Yewey 2 Harner nion Oil 3,35 Middle Run Formation 837 3,2 S (Janssens, 973) -2, Miami Levering Sun Oil Co. 3,42 Middle Run Formation 994 3,282 S (Summerson, 962) -2, Miami Walker National Associated Petroleum 3,5 Precambrian,35 3,5 S (Summerson, 962) -2, Morrow Myers 3 Ashland Oil & Refining Co. 4,9 Precambrian,6 4,2 S (Owens, 967) -2, Morrow Henry Wehmeyer 4,44 Precambrian 995 4,9 S (Janssens, 973) -3, Morrow Windbigler Poston 4,888 Precambrian,398 4,87 S (Janssens, 973) -3, Morrow McBee Wray 4,4 Precambrian,4 4,445 S (Janssens, 973) -3, Morrow Shaver-Neff nit 5 Kin-Ark Oil Co. 4,95 Precambrian,7 4,95 E -3, Morrow Bush -C Comanche Oil Co. 3,867 Precambrian 999 3,867 E -2, Morrow Irey Otter Creek Exploration 3,876 Precambrian,4 3,875 S (Janssens, 973) -2, Morrow Brewer Star Exploration Corp. 5, Precambrian,399 4,938 N,, E -3, Morrow Morris 7 Ohio Production Corp. 5,8 Precambrian,33 4,792 N, E -3, Morrow Hickok -4 EEI 4,77 Precambrian,398 4,682 N, -3, Morrow Lee Family Trust Knox Energy, Inc. 4,2 Precambrian,28 4,3 E -3, Muskingum Consolidation Coal CR 4 Carless Resources 7,38 Precambrian 928 7,373 E (Riley and others, 993) -6, Muskingum Goff Well Services, LLC 8, Precambrian 984 7,995 S -7, Noble llman Amoco Corp.,442 Precambrian,35,4 S (Janssens, 973) -, Noble FREC Noble Olive A- Anadarko E & P Co.,62 Precambrian 97,58, S -9, Paulding Arend Mt. Pleasant Mines 3, Precambrian 7 3,392-2, Perry Rush Creek Partners et al. Poling Co. 6,395 Precambrian 828 6,32 E (Riley and others, 993) -5, Pickaway Long A Kewanee Oil Co. 3,7 Precambrian 857 3,245 S (Summerson, 962) -2, Pickaway Croman McMahon-Bullington rilling 3,73 Precambrian 797 3,69 S (Janssens, 973) -2, Pickaway Miller Midwest Oil & Gas Co. 4,79 Precambrian 693 4,48 S (Owens, 967) -3, Pickaway Higgy Minuteman Exploration Co. 3,86 Precambrian 799 3,83 N, -3, Pickaway Kerns Ramco Oil & Gas Corp. 4,446 Precambrian 77 4,3 E (Riley and others, 993) -3, Pike Hurless Hill rilling 4, Precambrian 578 3,972 N,, E -3, Portage Viking Resources Viking Resources 8,797 Precambrian,6 8,72 N, -7, Putnam Barlage Ohio Oil Co. 3,377 Precambrian 74 3,35 S (Summerson, 962) -2, Richland Scott 2 Tri-State Producing 5,53 Precambrian,458 5,497 S (Janssens, 973) -4, Richland Empire Reeves Steel ivision - Empire Reeves Steel ivision 5,85 Precambrian,76 5,6 S (Janssens, 973) -3, Ross Clark Crest Oil Co. 3,863 Precambrian,33 3,845 S (Janssens, 973) -2, Ross Irvine Oxford Oil Co. 3,88 Precambrian 985 3,87 E (Riley and others, 993) -2, Sandusky Bruns Ohio Oil Co. 2,822 Precambrian 65 2,667 S (Janssens, 973) -2, Sandusky Hetrick Montgomery 2,796 Precambrian 59 2,7 (Summerson, 962) -2, Sandusky Haff East Ohio Gas Co. 3,23 Precambrian 644 3,92 S (Janssens, 973) -2, Sandusky Ayers unigan 2,76 Precambrian 633 2,76 S (Janssens, 973) -2, Sandusky Recker C. & E. Oil Co. 2,675 Precambrian 673 2,632 N, -, Sandusky Aleshire Maguire 2,759 Precambrian 76 2,756 N, E (Owens, 967) -2,5 atum well elevation above sea level Along-hole depth to top of Precambrian Precambrian-top data source Precambrian subsea value

13 Structure Contour Map on the Precambrian nconformity Surface Sandusky Kerbel Maguire 2,785 Precambrian 647 2,76 S, E (Janssens, 973) -2, Sandusky Vickery Environmental Vickery Environmental 2,932 Precambrian 62 2,927 (Janssens, 973) -2, Sandusky Vickery Environmental 2 Vickery Environmental 2,96 Precambrian 66 2,93-2, Sandusky Vickery Environmental 3 Vickery Environmental 2,92 Precambrian 68 2,89-2, Sandusky Vickery Environmental 4 Vickery Environmental 2,95 Precambrian 68 2,95-2, Sandusky Vickery Environmental A Vickery Environmental 2,98 Precambrian 66 2,936 N, -2, Sandusky Vickery Environmental 5 Vickery Environmental 2,943 Precambrian 68 2,934 N, E -2, Sandusky Vickery Environmental 6 Vickery Environmental 2,955 Precambrian 64 2,939 N, -2, Sandusky Weickert nit M & M Royalty, Ltd. 2,773 Precambrian 593 2,76 N, -2, Scioto Aristech Chemical Corp. Aristech Chemical Corp. 5,67 Precambrian 557 5,595 E -5, Scioto Aristech Chemical Corp. 2 Aristech Chemical Corp. 6,24 Precambrian NA NA directional well NA Scioto Smith Adobe Oil & Gas Corp. 4,432 Precambrian,23 4,382 E -3, Scioto Aristech Chemical Corp. 3 Aristech Chemical Corp. 6,9 Precambrian NA NA directional well NA Seneca Stigamire Ashland Oil & Refining Co. 3,7 Precambrian 796 3,47 S (Owens, 967) -2, Seneca Shults American Standard Energy 2,847 Precambrian 72 2,8 E -2, Seneca Watson American Standard Energy 2,96 Precambrian 74 2,844-2, Seneca Sendelbach American Standard Energy 2,67 Precambrian 769 2,62 E -, Seneca Hoover American Standard Energy 2,6 Precambrian 766 2,493 E -, Seneca Watson 2 American Standard Energy 2,796 Precambrian 759 2,762-2, Seneca Watson 4 American Standard Energy 2,83 Precambrian 75 2,84-2, Seneca M & B Asphalt GB-4 ONR ivision of Geological Survey 2,87 Precambrian 697 2,8 C, E (Wickstrom and others, 985) -2, Seneca Watson Heirs 2 Sun Oil Co. 2,935 Precambrian 7 2,78 S -2, Shelby Nelson Sun Oil Co. 3,275 Precambrian,5 3,8 E -2, Shelby Fogt Gump Oil Co. 3,36 Precambrian,37 3,28 E -2, Shelby Borland Funk Exploration 3,227 Precambrian,74 3,23-2, Stark Gibbs nit -K Range Resources 8,62 Precambrian,55 8,6 S, E -7, Summit Northampton Board of Trustees 2 KST Oil & Gas 7,99 Precambrian,6 7,5-6, Summit KST Oil & Gas 5 KST Oil & Gas 7,2 Precambrian,5 7,68-6, Trumbull Northstar nited 2 & L Energy, Inc. 9,38 Precambrian 9 8,9 E -8, Tuscarawas Belden Brick nit 9 () ONR ivision of Geological Survey 8,7 Precambrian 97 8,632 S, E -7, Tuscarawas General Clay Red Hill evelopment 8,72 Precambrian,33 8,59 S, E -7, nion Zenith Holding & Trading Corp. H. H. & R. Operating 3,348 Precambrian, 3,35 S (Janssens, 973) -2, nion Lane T. & W. Oil Co. 2,99 Precambrian 996 2,985 N, (Owens, 967) -, nion Graver Funk Exploration 3,435 Precambrian 966 3,43 E (Warner, 988) -2, nion Yoder Funk Exploration 3,5 Precambrian 97 3,45 E (Warner, 988) -2, nion Kindig Funk Exploration 3,34 Precambrian 962 3,34 E -2, nion Black Funk Exploration 3,395 Precambrian 987 3,39 E (Warner, 988) -2, nion Low Funk Exploration 3,438 Precambrian 974 3,49-2, nion Inskeep Titan Energy 3,5 Precambrian 97 3,59 N, -2, Van Wert Miller 5 West Ohio Oil & Gas 3,24 Precambrian 82 3,24-2, Warren American Aggregates S-2 ONR ivision of Geological Survey 5,38 Middle Run Formation, 3,458 C, E (Shrake and others, 99) -2, Wayne Steiner 2 East Ohio Gas Co. 6,99 Precambrian 96 6,94 (Summerson, 962) -5, Wayne rake Waldron 6,897 Precambrian,5 6,728 S (Janssens, 973) -5, Wayne CRC iscovery Hard Rock rilling & Prod., LLC 6,429 Precambrian,42 6,286-5, Williams Kennerk Beglinger 4,67 Precambrian 842 3,922 S (Janssens, 973) -3, Williams Cook Columbia Gas Trans. Co. 4,49 Precambrian 95 4,489 S, E -3, Wood Knauss Southern Triangle Oil Co. 2,764 Precambrian 694 2,72 S (Owens, 967) -2, Wood Peek O Neill 2,77 Precambrian 698 2,76 N, E (Owens, 967) -2, Wood Smith Kin-Ark Oil Co. 2,785 Precambrian 677 2,775 E -2, Wood Carter Kin-Ark Oil Co. 2,82 Precambrian 673 2,8 (Janssens, 973) -2,52 4 American Petroleum Institute well number changed from 22 map.

14 Baranoski TABLE 2. Well data for control points on map PG-23 (cont.) Precambrian-top data source: C = core; = driller; E = electric-log interpretation; N = no sample cuttings; S = sample-cuttings interpretation, by Baranoski unless otherwise noted nique well County Lease name Well no. Company name number Well total depth Formation at total depth Wood Asmus et al. J.R.S. 2,8 Precambrian 67 2,85 S (Janssens, 973) -2, Wood Kramer -A Anschutz Corp. 2,88 Precambrian 69 2,86 E -2, Wood Freehan Texas Gas Exploration Corp. 2,867 Precambrian 69 2,862-2, Wood Killian Brailey 2,927 Precambrian 688 2,884 S (Summerson, 962) -2, Wyandot Heck Ohio Oil Co. 2,8 Precambrian 86 2,8 S (Owens, 967) -, Wyandot Frey Comanche Oil Co. 2,875 Precambrian 868 2,86 S (Janssens, 973) -, Wyandot Bowen Texaco 2,9 Precambrian 846 2,85 S (Owens, 967) -2, Wyandot Eyestone Minnesota-Ohio Oil Co. 3,26 Precambrian 942 3, S (Janssens, 973) -2, Wyandot Kuenzli Berea Oil & Gas Corp. 3,49 Precambrian 893 3,9 E -2, Wyandot Hansel Ramah Oil 2,833 Precambrian 98 2,82 S, E -, Wyandot Parsell ibble & Miller 5,632 Precambrian 9 3,4 S (Summerson, 962) -2,3 INIANA Allen Gibson Tecumseh Oil & Gas Co. 3,57 Precambrian 822 3,497 Indiana Geological Survey -2, Allen Leuenberger Northern Indiana Public Service 3,672 Precambrian 797 3,484 S, E (Rudman and Rupp, 993) -2, Fayette Scott Gulf Oil 3,955 Precambrian 959 3,942 S, E (Rudman and Rupp, 993) -2, Henry May Ohio Oil Co. 3,664 Precambrian,6 3,649 Indiana Geological Survey -2, Jay Binegar Petroleum evelopment 3,44 Precambrian 948 3,35 S (Summerson, 962) -2, Steuben Swager Swager 6,866 Precambrian,46 4,93 Indiana Geological Survey -3, Switzerland Collins Ashland 4, Precambrian 88 3,974 Indiana Geological Survey -3, Switzerland Sullivan Ashland 4,5 Precambrian 794 4,4 Indiana Geological Survey -3, Wayne oddridge Porter Gordon 3,97 Precambrian 857 3,435 Indiana Geological Survey (Owens, 967) -2,578 KENTCKY 65 Boone Conner Ford 4,89 Middle Run Formation 98 3,695 Kentucky Geological Survey -2, Boone uke East Bend Power Battelle 3,72 Middle Run Formatiom 526 3,532 Kentucky Geological Survey -3, Boyd Inland Gas 533 Inland Gas Co. 9,595 Precambrian 862 8,55 Kentucky Geological Survey -7, Boyd McKeand 535 Inland Gas Co. 9,449 Precambrian 868 9,385 Kentucky Geological Survey -8, Boyd Fannin 537 Inland Gas Co. 7,828 Precambrian 79 6,757 Kentucky Geological Survey -6, Campbell Wilson R- Ashland Oil & Refining Co. 3,64 Precambrian 757 3,39 Kentucky Geological Survey -2, Carter Stapleton - Ashland Oil & Refining Co. 5, Precambrian 956 5,22 Kentucky Geological Survey -4, Carter Inland Gas 538 Inland Gas Co. 7,272 Precambrian 796 7,76 Kentucky Geological Survey -6, Carter uncan 547 Inland Gas Co. 5,62 Precambrian 985 5,42 Kentucky Geological Survey -4, Carter Stamper 887T nited Fuel Gas Co. 5,85 Precambrian 857 5,48 Kentucky Geological Survey -4, Carter Hansen Aggregates Kentucky Geological Survey 4,835 Precambrian 753 4,72 Kentucky Geological Survey -3, Elliot Kazee Ashland Exploration,9 Precambrian 727,967 Kentucky Geological Survey -, Greenup Newell Commonwealth Gas Corp. 5,93 Precambrian,53 5,59 Kentucky Geological Survey -4, Lawrence Young 542 Inland Gas Co. 2,72 Precambrian 884 2,544 Kentucky Geological Survey -, Lewis Adams Thomas 4,9 Precambrian 56 4,77 Kentucky Geological Survey -3, Lewis Shephard 96 nited Fuel Gas Co. 4,55 Precambrian 98 4,529 Kentucky Geological Survey -3, Lewis Wolfe, ewey et al. Ashland Oil & Refining Co. 5,82 Precambrian,3 5,24 Kentucky Geological Survey -3, Mason Rawlings 96T nited Fuel Gas Co. 3,34 Precambrian 769 3,29 Kentucky Geological Survey -2, Nicholas Mynear nion Light 2,958 Precambrian 7 2,922 Kentucky Geological Survey -2, Rowan Jones Pennzoil Co. 4,99 Precambrian,99 4,967 Kentucky Geological Survey -3, Rowan Bailey Peter Henderson Oil 3,82 Precambrian 737 3,79 Kentucky Geological Survey -3,53 MICHIGAN Branch Lindsey-Hostetler Consumers 5,439 Precambrian 89 5,375 Michigan Geological Survey -4, Branch Clark Consumers 5,475 Precambrian 887 5,46 Michigan Geological Survey -4, Branch Atlantic Richfield Co. & Johnson -3 Atlantic Richfield Co. 5,2 Precambrian 9 5,2 Michigan Geological Survey -4,299 atum well elevation above sea level Along-hole depth to top of Precambrian Precambrian-top data source Precambrian subsea value

15 Structure Contour Map on the Precambrian nconformity Surface Branch Atlantic Richfield Co. -3 Atlantic Richfield Co. & Gaglio 5,377 Precambrian 98 5,27 Michigan Geological Survey -4, Hillsdale Rowe Marathon Oil Co. 5,97 Precambrian,7 5,866 Michigan Geological Survey -4, Lenawee Taylor Eckert 3,92 Precambrian 75 3,865 Michigan Geological Survey -3, Monroe Sancrant Beck 5,465 Precambrian 669 3,595 Michigan Geological Survey -2, Monroe Chapman Sturman 3,377 Precambrian 597 3,343 Michigan Geological Survey -2, Monroe Shimp Ferguson & Garrison 3,67 Precambrian 686 3,64 S (Janssens, 973) -2, Monroe Cousino - Reef Petroleum 3,52 Precambrian 646 3,47 Michigan Geological Survey -2,824 PENNSYLVANIA Beaver BC Ergon 2,45 Precambrian,92,8 Pennsylvania Geological Survey -, Crawford Kardosh Benedum & Ark-La Gas 8,3 Precambrian,337 7,924 Pennsylvania Geological Survey -6, Crawford Ewig Kastle Resources 7,68 Precambrian,3 7,8 Pennsylvania Geological Survey -6, Erie Eastern American Energy Reemsnyder 7,345 Precambrian,24 7,338 Pennsylvania Geological Survey -6, Erie Great Lakes Energy 2 Cross 8,35 Precambrian,45 7,359 S, E -5, Mercer Temple Peoples Natural Gas 9,99 Precambrian,344 9,82 Pennsylvania Geological Survey -8, Mercer Fleck Peoples Natural Gas 9,246 Precambrian,3 9,38 Pennsylvania Geological Survey -7,83 WEST VIRGINIA Cabell Kingery Cyclops 8,552 Precambrian 667 8,56 West Virginia Geological and Economic Survey -7, Jackson McCoy Exxon SA 7,675 Precambrian 943 7,626 West Virginia Geological and Economic Survey -6, Lincoln McCormick Exxon SA 9,24 Precambrian 772 9,74 West Virginia Geological and Economic Survey -8, Mason Arrington nited Fuel Gas Co. 8,635 Precambrian 69 8,558 West Virginia Geological and Economic Survey -7, Mason Jividen nion rilling,598 Precambrian 646,564 West Virginia Geological and Economic Survey -9, Mason Appalachian Power Co. Appalachian Power Co. 9,9 Precambrian 68 9,4 S, C, E -8, Wayne Smith Exxon SA 4,6 Precambrian 622 4,548 West Virginia Geological and Economic Survey -3, Wood Power Oil Hope Natural Gas 3,33 Precambrian,65 3,272 West Virginia Geological and Economic Survey -2, Wood eem Exxon SA 3,266 Precambrian 726 3,4 West Virginia Geological and Economic Survey -2,528 ONTARIO, CANAA T83 2 Essex Klie Imperial Oil 3,222 Precambrian 629 3,22 Ontario Ministry of Natural Resources -2,59 T85 2 Essex Field Consolidated West Petroleum 3,345 Precambrian 64 3,34 Ontario Ministry of Natural Resources -2,737 T96 2 Essex Wilkinson Imperial Oil 3,439 Precambrian 67 3,43 Ontario Ministry of Natural Resources -2,824 T534 Essex Lewis 23 Lewis 3,223 Precambrian 58 3,9 Ontario Ministry of Natural Resources -2,69 T2843 Essex Government of Ontario 2 Amerada Hess 3,72 Precambrian 63 3,22 Janssens (973) -2,392 T6369 Essex Mersea 8-5-B Consumers et al. 3,47 Precambrian 585 3,466 Ontario Ministry of Natural Resources -2,88 T Essex Mersea 8-4-A Consumers et al. 3,53 Precambrian 586 3,45 Ontario Ministry of Natural Resources -2,865 T Essex Mersea 5-2-A Consumers et al. 3,476 Precambrian 585 3,43 Ontario Ministry of Natural Resources -2,828 T Essex Mersea 7-2-I Consumers et al. 3,53 Precambrian 587 3,439 Ontario Ministry of Natural Resources -2,852 T Essex Mersea 3-3-A 3387 Consumers et al. 3,484 Precambrian 587 3,44 Ontario Ministry of Natural Resources -2,827 T654 4 Essex Mersea 5-2-I 3388 Consumers et al. 3,54 Precambrian 592 3,446 Ontario Ministry of Natural Resources -2,854 T Essex Mersea --I 342 Consumers et al. 3,478 Precambrian 594 3,423 Ontario Ministry of Natural Resources -2,829 T Essex Mersea 6-5-B omego Terron 3,47 Precambrian 585 3,428 Ontario Ministry of Natural Resources -2,843 T75 2 Essex Gosfield South 8-B-III 3422 Consumers 3,42 Precambrian 637 3,36 Ontario Ministry of Natural Resources -2,724 T72 4 Essex Mersea 3-5-I Consumers et al. 3,54 Precambrian 6 3,46 Ontario Ministry of Natural Resources -2,86 T736 2 Essex Gosfield South Consumers 3,4 Precambrian 633 3,323 Ontario Ministry of Natural Resources -2,69 T Essex BP Ram 3,353 Precambrian 68 3,33 Ontario Ministry of Natural Resources -2,72 T754 2 Essex Mersea Telesis et al. 3,474 Precambrian 6 3,48 Ontario Ministry of Natural Resources -2,793 T Essex BP 4 Ram 3,535 Precambrian 579 3,488 Ontario Ministry of Natural Resources -2,99 T783 2 Essex Gosfield South 4-4-III Telesis 3,45 Precambrian 67 3,398 Ontario Ministry of Natural Resources -2,727 T Essex Gosfield South -I-III 3432 Consumers/Paladin 3,444 Precambrian 65 3,397 Ontario Ministry of Natural Resources -2,746 T879 2 Essex Colchester South 7-6-V 2 Canenerco/CNR 3,362 Precambrian 69 3,328 Ontario Ministry of Natural Resources -2,79 T889 2 Essex Gosfield South Canenerco/CNR 3,379 Precambrian 664 3,36 Ontario Ministry of Natural Resources -2,697 T224 2 Essex Colchester South Algonquin 3,7 Precambrian 593 3,43 Ontario Ministry of Natural Resources -2,55 T Kent Government of Ontario 35 Consumers 4,365 Precambrian 594 4,3 Ontario Ministry of Natural Resources -3,76 T Kent Government of Ontario 373 Consumers 4,357 Precambrian 595 4,29 Ontario Ministry of Natural Resources -3,695 T Kent Government Of Ontario 352 Consumers 4,8 Precambrian 594 4,7 Ontario Ministry of Natural Resources -3,53 T685 2 Kent Lake Erie 24-V iamond Shamrock 4,7 Precambrian 59 4,627 Ontario Ministry of Natural Resources -4,37

16 2 Baranoski TABLE 3. Seismic reflection profiles on map PG-23 Map reference Availability Company Number of lines Total miles COCORP OH- Public domain/restricted Consortium for Continental Reflection Profiling 72. COCORP OH-2 Public domain/restricted Consortium for Continental Reflection Profiling 8. A Public domain ONR ivision of Geological Survey 3.6 B Public domain Columbia Natural Resources 5.2 C Public domain BP Chemical (formerly Vistron Corp.) 72. Public domain Reserve Environmental Services 7.8 E Public domain AK Steel Corp. (formerly Armco Steel Corp.) 4 5. F Restricted NGO evelopment Corp. 6.5 G Public domain/restricted CGAS Exploration, Inc. 7.5 H Public domain Tomen Agro Inc. (formerly Calhio Chemicals) I Restricted Excalibur Exploration 4.3 J Public domain Waste Management of Ohio (formerly Vickery Environmental) K Public domain Aristech Chemical Corp. (formerly.s. Steel) L Public domain ONR ivision of Geological Survey 7.8 ACKNOWLEGMENTS This work was supported, in part, by funding from the Injection Well Review Fund and was performed in cooperation with the Ohio Environmental Protection Agency, ivision of rinking and Ground Waters. Richard Ostrowski with the Ontario Oil, Gas & Salt Resources Library in London, Ontario, provided additional Ontario data. Staff from the Ohio Geological Survey provided additional support. Michael Solis reviewed an early revised version of the map. ean Martin formatted the digital map data and set up the map layout. Lisa Van oren updated tables and formatted the map into the final PF file. Chuck Salmons edited final copy. REFERENCES CITE Aggarwal, Y.P., 987, Seismicity and tectonic structure in northeastern Ohio Implications for earthquake hazard to the Perry Nuclear Power Plant: Sensearth, Inc., Report to the Ohio Citizens for Responsible Energy, Inc., 85 p. Ammerman, M.L., and Keller, G.R., 979, elineation of Rome Trough in eastern Kentucky by gravity and deep drilling data: American Association of Petroleum Geologists Bulletin, v. 63, no. 3, p Baranoski, M.T., 989, Another opinion about the origin of the Cambridge Arch of southeastern Ohio [abs.]: Ohio Geological Society, November 989 Geogram, 2 p. Baranoski, M.T., 99, The Cambridge monocline A structural inversion along a major cross-strike discontinuity in southeastern Ohio [abs.], in Appalachian reservoir heterogeneity The twenty-first annual Appalachian Petroleum Geology Symposium, program and abstracts: West Virginia Geological and Economic Survey Publication X-ICW-2, p. 3. Baranoski, M.T., 993a, Interpretation of seismic data acquired over the Serpent Mound disturbance in Adams County, Ohio, in An update on Ohio s subsurface geology, Proceedings from the technical symposium, October 993, Canton, Ohio: Ohio Geological Society Publication 9, 6 p. Baranoski, M.T., 993b, Regional tectonic features affecting the Knox Group including the Rose Run sandstone in eastern Ohio and adjacent areas [abs.], in Innovative concepts in reservoir characterization The twenty-fourth annual Appalachian Petroleum Geology Symposium, program and abstracts: West Virginia Geological and Economic Survey, X-ICW-5, p. 2. Baranoski, M.T., 993c, The Cambridge monocline A revisitation of a major positive structural inversion in southeastern Ohio, in An update on Ohio s subsurface geology, Proceedings from the technical symposium, October 993, Canton, Ohio: Ohio Geological Society Publication 9, 9 p. Baranoski, M.T., 22, Structure contour map on the Precambrian unconformity surface in Ohio and related basement features: Columbus, Ohio epartment of Natural Resources, Ohio epartment of Natural Resources, ivision of Geological Survey Map PG-23, scale :5,, 8 p. text. Baranoski, M.T., and Riley, R.A., 988, Analysis of stratigraphic and production relationships of evonian-shale gas reservoirs in Lawrence County, Ohio: Ohio epartment of Natural Resources, ivision of Geological Survey Open- File Report 88-2, 3 p. Baranoski, M.T., Andersson, Jenny, ean, S.L., and Brown, V.M., 22, Redefining the Late Mesaproterozoic Grenville Front in Ohio and implications of crustal evolution in the

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Black,.F.B., MacQuown, W.C., and ehaas, R.J., 98, The relation of dolomite associated with faults to the stratigraphy and structure of central Kentucky:.S. Geological Survey Professional Paper 5-A, 9 p. Brannock, M.C., 993, The Starr Fault System of southeastern Ohio, in An update on Ohio s subsurface geology, Proceedings from the technical symposium, October 993, Canton, Ohio: Ohio Geological Society Publication 9, 35 p. Bucher, W.H., 92, Cryptovolcanic structure in Ohio of the type of the Steinheim Basin [abs.]: Geological Society of America Bulletin, v. 32, p Bucher, W.H., 933, eber eine typische kryptovulkanische störung im südlichen Ohio: Geologische Rundschau, v. 23a (Salomon-Calvi Festschrift), p Bucher, W.H., 935, A crypto-volcanic structure in southern Ohio: Compass, v. 5, p Bucher, W.H., 936, Cryptovolcanic structures in the nited States: International Geologic Congress (933), Report of the 6th Session, v. 2, p.,55,84. Bucher, W.H., 963, Cryptoexplosion structure caused from without or within the Earth ( astroblemes or geoblemes ): American Journal of Science, v. 26, p Bull, Colin, Corbató, C.E., and Zahn, J.C., 967, Gravity survey of the Serpent Mound area, southern Ohio: Ohio Journal of Science, v. 67, no. 6, p Cable, M.S., and Beardsley, R.W., 984, Structural controls on Late Cambrian and Early Ordovician carbonate sedimentation in eastern Kentucky: American Journal of Science, v. 284, p Calvert, G.C., 983, Subsurface structure of the Burning Springs Anticline, West Virginia Evidence for a two-stage structural development: Appalachian Basin Industrial Associates Program, p Calvert, W.L., 974, Sub-Trenton structure of Ohio, with views on isopach maps and stratigraphic sections as basis for structural myths in Ohio, Illinois, New York, Pennsylvania, West Virginia, and Michigan: American Association of Petroleum Geologists Bulletin, v. 58, no. 6, p Carman, J.E., 928, Resumé of the geology of Lucas County, Ohio [abs.]: Ohio Academy of Sciences Proceedings, v. 8, pt. 4, p Carman, J.E., and Stout, W.E., 934, Relationship of accumulation of oil to structure and porosity in the Lima- Indiana field, in Wrather, W.E., and Lahee, F.H., eds., Problems of petroleum geology A sequel to structure of typical American oil fields (Sidney Powers memorial volume): Tulsa, Okla., American Association of Petroleum Geologists, p Carter, T.R., Trevail, R.A., and Easton, R.M., 996, Basement controls on some hydrocarbon traps in southern Ontario, Canada, in van der Pluijm, B.A., and Catacosinos, P.A., eds., Basement and basins of eastern North America: Geological Society of America Special Paper 38, p Coogan, A.H., 99, A fault-related model for the facies of the Lower Silurian Clinton Sandstone interval in the subsurface of eastern Ohio: Northeastern Geology, v. 3, no. 2, p. 29. Coogan, A.H., and Peng, Shengfeng, 993, Sauk Sequence wedge Structural and depositional setting for Knox and older petroleum reservoirs in Ohio, in An update on Ohio s subsurface geology, Proceedings from the technical symposium, October 993, Canton, Ohio: Ohio Geological Society Publication 9, 2 p. Coogan, A.H., and Reeve, R.L., 985, evonian Oriskany reservoir and trap in Coshocton County, Ohio: Northeastern Geology, v. 7, nos. /2, p Culshaw, Nicholas, and ostal, Jaroslav, 22, Amphibolites of the Shawanaga domain, Central Gneiss Belt, Grenville Province, Ontario Tectonic setting and implications for relations between the Central Gneiss Belt and Midcontinental SA: Precambrian Research, v. 3, nos. /2, p Culotta, R.C., Pratt, T., and Oliver, J., 99, A tale of two sutures COCORP deep seismic surveys of the Grenville province in the eastern.s. midcontinent: Geology, v. 8, p ean, S.L., Wicks, J.L., and Baranoski, M.T., 998, A new geologic interpretation of reprocessed Ohio COCORP seismic lines [abs.]: American Association of Petroleum Geologists Bulletin, v. 82, no. 9, p.,766.

18 4 Baranoski enison, R.E., Lidiak, E.G., Bickford, M.E., and Kisvarsanyi, E.B., 984, Geology and geochronology Precambrian rocks of the central interior region of the nited States:.S. Geological Survey Professional Paper 24-C, 2 p. eyling, T.H., 993, Moss Run prospect Structure in Lawrence Township, Washington County, Ohio, in An update on Ohio s subsurface geology, Proceedings from the technical symposium, October 993, Canton, Ohio: Ohio Geological Society Publication 9, 7 p. rahovzal, J.A., Harris,.C., Wickstrom, L.H., Walker, an, Baranoski, M.T., Keith, Brian, and Furer, L.C., 992, The East Continent Rift Basin A new discovery: Ohio epartment of Natural Resources, ivision of Geological Survey Information Circular 57, p. rahovzal, J.A., and Noger, M.C., 995, Preliminary map of the structure of the Precambrian surface in eastern Kentucky: Kentucky Geological Survey Map and Chart Series 8, Series XI, 9 p. Galbraith, R.M., IV, 968, Peripheral deformation of the Serpent Mound cryptoexplosion structure in Adams County, Ohio: Cincinnati, Ohio, niversity of Cincinnati, M.S. thesis (unpub.), 47 p. Galbraith, R.M., IV, and Koucky, F.L., 969, Peripheral deformation of the Serpent Mound cryptoexplosion structure in Adams County, Ohio [abs.]: Geological Society of America Abstracts with Programs, v., pt. 6, p. 7. Gonterman, J.R., 973, Petrographic study of the Precambrian basement rocks of Ohio: Columbus, Ohio State niversity, M.S. thesis (unpub.), 39 p. Gray, J.., Struble, R.A., Carlton, R.W., Hodges,.A., Honeycutt, F.M., Kingsbury, R.H., Knapp, N.F., Majchszak, F.L., and Stith,.A., 982, An integrated study of the evonian-age black shales in eastern Ohio: Ohio epartment of Natural Resources, ivision of Geological Survey,.S. epartment of Energy Report No. OE/ET , 69 p., maps and cross sections. Green, A.G., Millereit, B., avidson, A., Spencer, C., Hutchinson,.R., Cannon, W.F., Lee, M.W., Agena, W.F., Behrendt, J.C., and Hinze, W.J., 988, Crustal structure of the Grenville front and adjacent terranes: Geology, v. 6, no. 9, p Green,.A., 957, Trenton structure in Ohio, Indiana, and northern Illinois: American Association of Petroleum Geologists Bulletin, v. 4, no. 4, p Halls, H.C., 978, The late Precambrian central North America rift system A survey of recent geological and geophysical investigations, in Neuman, E.-R., and Ramberg, I.B., eds., Tectonics and geophysics of continental rifts: NATO Advanced Study Institute, Series C, Mathematical and Physical Sciences, v. 37, p. 23. Harper, J.A., 989, Effects of recurrent tectonic patterns on the occurrence and development of oil and gas resources in western Pennsylvania: Northeastern Geology, v., no. 4, p Harper, J.A., and Laughrey, C.., 987, Geology of the oil and gas fields of southwestern Pennsylvania: Pennsylvania Geological Survey Mineral Resource Report 87, 66 p. Harper, J.L., 939, Oil-gas geology of S.W. Ohio: Oil & Gas Journal, v. 38, no. 8, p Harris,.C., and rahovzal, J.A., 996, Cambrian hydrocarbon potential indicated in Kentucky s Rome Trough: Kentucky Geological Survey Information Circular 54, Series XI, p. Harris, L.., 975, Oil and gas data from Lower Ordovician and Cambrian rocks of the Appalachian basin:.s. Geological Survey Miscellaneous Investigations Map I-97-, scale :2,5,, 3 sheets. Hauser, E.C., 993, Grenville foreland thrust belt hidden beneath the eastern.s. midcontinent: Geology, v. 2, no., p Heyl, A.V., 972, The 39th parallel lineament and its relationship to ore deposits: Economic Geology, v. 67, no. 7, p Hinze, W.J., Braile, L.W., Keller, G.R., and Lidiak, E.G., 987, An update of midcontinent tectonism:.s. Nuclear Regulatory Commission Report, Contract No. NRC , 4 p. Hoehn, M.H., 99, An integrated geophysical study of the Grenville Province in the greater Lake Erie region: West Lafayette, Ind., Purdue niversity, M.S. thesis (unpub.), p. Hoehn, M.H., and Hinze, W.J., 992, An integrated geophysical study of the Grenville Province in the greater Lake Erie region: Purdue niversity, Report prepared for Ontario Hydro Toronto, 99 p. Janssens, Adriaan, 973, Stratigraphy of Cambrian and Lower Ordovician rocks in Ohio: Ohio epartment of Natural Resources, ivision of Geological Survey Bulletin 64, 97 p. Keller, G.R., Bland, A.E., and Greenberg, J.K., 982, Evidence for a late Precambrian tectonic event (rifting) in the eastern mid-continent region, SA: Tectonophysics, v. 93, no., p Keller, G.R., Lidiak, E.G., Hinze, W.J., and Braile, L.W., 983, The role of rifting in the tectonic development of the midcontinent, SA: Tectonophysics, v. 94, special issue, p Koucky, F.L., 975, Serpent Mound cryptoexplosion structure Field trip guidebook for the 26th annual Ohio Intercollegiate Field Conference: Wooster, Ohio, College of Wooster, 6 p. 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19 Structure Contour Map on the Precambrian nconformity Surface 5 Lidiak, E.G., and Zietz, Isidore, 976, Interpretation of aeromagnetic anomalies between latitudes 37 N and 38 N in the eastern and central nited States: Geological Society of America Special Paper 67, 37 p. Locke, John, 838, Prof. Locke s geological report, in Mather, W.W., 2nd Annual Report of the Geological Survey of the State of Ohio: Columbus, [State of Ohio Legislature], p Lockett, J.R., 947, evelopment of structures in basin areas of northeastern nited States: American Association of Petroleum Geologists Bulletin, v. 3, no. 3, p Lucius, J.E., and von Frese, R.R.B., 988, Aeromagnetic and gravity anomaly constraints on the crustal geology of Ohio: Geological Society of America Bulletin, v., no., p. 46. Mayhew, G.H., 969, Seismic reflection study of the subsurface structure in western and central Ohio: Columbus, Ohio State niversity, Ph.. dissertation (unpub.), 77 p. 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20 6 Baranoski Rudman, A.J., Summerson, C.H., and Hinze, W.J., 965, Geology of basement in Midwestern nited States: American Association of Petroleum Geologists Bulletin, v. 49, no. 7, p Santos, J.O., Hartmann, L.A., McNaughton, N.J., Easton, R.M., Rea, R.G., and Potter, P.E., 22, Sensitive high resolution ion microprobe (SHRIMP) detrital zircon geochronology provides new evidence for a hidden Neoproterozoic foreland basin in the eastern Midwest,.S.A.: Canadian Journal of Earth Sciences, v. 39, no., p.,55,55. Sappenfield, L.W., 95, A magnetic survey of the Adams County cryptovolcanic structure: Cincinnati, Ohio, niversity of Cincinnati, M.S. thesis (unpub.), 27 p. 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21 Structure Contour Map on the Precambrian nconformity Surface 7 Wagner, W.R., 976, Growth faults in Cambrian and Lower Ordovician rocks of western Pennsylvania: American Association of Petroleum Geologists Bulletin, v. 6, no. 3, p Warner,.L., 988, Hydrogeologic and hydrochemical assessment of the basal sandstone and overlying Paleozoic age units for wastewater injection and confinement in the north central region: Oklahoma City, Okla., nderground Injection Practices Council, 83 p. Webb, E.J., 969, Geologic history of the Cambrian System in the Appalachian basin, in Proceedings of Technical Sessions, Kentucky Oil and Gas Association, 33rd annual meeting, 969: Kentucky Geological Survey Special Publication 8, Series X, p. 75. Webb, E.J., 98, Cambrian sedimentation and structural evolution of the Rome trough in Kentucky: Cincinnati, Ohio, niversity of Cincinnati, Ph.. dissertation (unpub.), 7 p. Wicks, John, 996, Structural history of the Killbuck area, Holmes County, Ohio with implications for Knox exploration, in Enhanced recovery Historical development and future potential in Ohio and the Appalachian Basin; and Integration of geology and geophysics in exploration, Proceedings of the fourth annual technical symposium, October 9, 996, Canton, Ohio: Ohio Geological Society Publication 3, p Wickstrom, L.H., 99, A new look at Trenton (Ordovician) structure in northwestern Ohio: Northeastern Geology, v. 2, no. 3, p. 33. Wickstrom, L.H., Botoman, George, and Stith,.A., 985, Report on a continuously cored hole drilled into the Precambrian in Seneca County, northwestern Ohio: Ohio epartment of Natural Resources, ivision of Geological Survey Information Circular 5, one sheet. Wickstrom, L.H., Gray, J.., and Stieglitz, R.., 992, Stratigraphy, structure, and production history of the Trenton Limestone (Ordovician) and adjacent strata in northwestern Ohio: Ohio epartment of Natural Resources, ivision of Geological Survey Report of Investigations 43, 78 p. Wolfe, P.J., Richard, B.H., and Potter, P.E., 993, Potential seen in Middle Run basins of western Ohio: Oil & Gas Journal, v. 9, no. 4, p Woodward, H.P., 96, Preliminary subsurface study of southeastern Appalachian Interior Plateau: American Association of Petroleum Geologists Bulletin, v. 45, no., p.,634,655. Worthing, R.W., 965, Structural evidence of regional block movement of the craton in the eastern interior of the North American Continent: Shale Shaker, v. 5, no., p. 8.

22 STATE OF OHIO MAP PG-23 STRCTRE CONTOR MAP ON THE PRECAMBRIAN NCONFORMITY SRFACE IN OHIO AN RELATE BASEMENT FEATRES EPARTMENT OF NATRAL RESORCES IVISION OF GEOLOGICAL SRVEY Thomas J. Serenko, Chief VERSION 2. 6/23 by Mark T. Baranoski GIS Cartography by ean R. Martin ESSEX 3,695 2,99 5,99 5 2,392 2,926 PELEE POINT 5,3 O T T A W A A S H T A B L A 2,26 2,34 SEE INSET MAP 3,957 C R A W F O R 8 2,433 2,38 2, ,26 2,29 2,279 37,989 2,265 2,9 2,46 2 2L O G A N 2,65 AREA OF 33 A R K E 2,243 RANOLPH ABSENT MT. SIMON 32 2,5 4 4,5 SEE INSET MAP 4 2,49 4 C H A M P A I G N 3,22 2,998 2,635 2,969 2,464 3,778 3, ,73 4,56 4 3,8 53 3,738 3,945 F 5,49 2,9 7, F A I R F I E L 5 G R E E N E 2,578 4 NION F A Y E T T E W A R R E N FRANKLIN 7 L 2,433 C L I N T O N 2,562 2,573 2, G SEE INSET MAP 6 2,456 3,455 W A S H I N G T O N 3,54 2, WO O G A L L I A 5,42 4 2,633 5,52 3,93 8, JACKSON 5,49 3,94 CAMPBELL 2 d 3,67 MASON 5,36 d 7,849 3,968 7, sea level Bellefontaine Outlier surface topography B OY COSHOCTON 3,62 HARRISON evonian WEST VIRGINIA BELMONT BORBON 2, 2,5 4,9 6,48 4,264 3,53, Precambrian 3,768 WOO FO R IO OH AN ERSON unconformity surface P LA T FO R 3, M EAST CONTINENT RIFT BASIN 5, 9,922 KANAWHA CABELL 6,38 5 Grenville Province Granite-Rhyolite Province and East Continent Rift Basin 8,57 7,643 6, LAW RENCE LINCOLN 5 3,968 8, Map showing Granite-Rhyolite Province, East Continent Rift Basin, Grenville Province, and major Precambrian structural features defined by geopotential and seismic reflection data.,24 35 Ordovician 8, 9, Cambrian Precambrian unconformity surface, GRENVILLE PROVINCE atum = sea level Vertical exaggeration = 5X iagram based on interpretation approximately along COCORP OH- and OH-2 seismic lines, SEISMIC REFLECTION PROFILES Baranoski, M.T., 23, Structure contour map on the Precambrian unconformity surface in Ohio and related basement features (ver. 2.): Columbus, Ohio epartment of Natural Resources, ivision of Geological Survey Map PG-23, scale :5,, 7 p. text. The information contained herein may be updated or edited in the future. Future releases of this material, if altered, will display a revision date. sers should check to ensure they have the latest version and reference the appropriate revision date if it is being used in other works. Availability COCORP OH- COCORP OH-2 P/R P/R P P P P P R P/R P R P P P A B Neither the Ohio epartment of Natural Resources, nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, expressed or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of this product. Any use thereof for a purpose other than that for which said information or product was intended shall be solely at the risk of the user. C E F G H I J K L Projection of map data is NA83 TM zone 7N. Map reference P = public domain; R = restricted. Company Number of lines Total miles Consortium for Continental Reflection Profiling Consortium for Continental Reflection Profiling ONR ivision of Geological Survey Columbia Natural Resources BP Chemical (formerly Vistron Corp.) Reserve Environmental Services AK Steel Corp. (formerly Armco Steel Corp.) NGO evelopment Corp. CGAS Exploration, Inc. Tomen Agro, Inc. (formerly Calhio Chemicals) Excalibur Exploration Waste Management of Ohio (formerly Vickery Environmental) Aristech Chemical Corp. (formerly.s. Steel) ONR ivision of Geological Survey Structural Feature unnamed fault (Lake Co.) RomeTrough Fault System Cambridge Cross-Strike Structural iscontinuity unnamed fault (Belmont Co.) W. Hickman Creek-Bryan Station Fault Burning Springs Fault System Ohio River Fault Bowling Green Fault System unnamed faults (elaware Co.) Middleburg Fault Pittsburgh-Washington Cross-Strike Structural iscontinuity unnamed fault (Sandusky Co.) unnamed faults (Washington Co.) unnamed faults (Madison Co.) unnamed faults (Scioto Co.) Serpent Mound impact structure unnamed fault (Warren Co.) unnamed fault (Hancock Co.) Tiffin Fault unnamed faults (Fayette, Pickaway, Ross Cos.) Harlem Fault unnamed faults (Fayette Co.) unnamed fault (Seneca Co.) Starr Fault System unnamed faults along COCORP seismic lines unnamed fault (Highland Co.) Akron Fault Suffield Fault System SmithTownship Fault Highlandtown Fault Anna-Champaign Fault Logan Fault Auglaize Fault Crawford Faults Kentucky River Fault System Killbuck ome Marion Fault Maumee Fault Outlet Fault Plum Run Quarry Fault Bellefontaine Outlier Faults unnamed faults (Adams Co.) unnamed fault (Wyandot Co.) unnamed fault (Ashtabula Co.) unnamed fault (Ashtabula Co.) Akron Magnetic Boundary Seneca Anomaly Coshocton Zone Fort Wayne Rift Southwestern Ohio Anomaly Grenville FrontTectonic Zone tica Mountain Fault tica Mountain Structure Inset Map 7, scale :,. PIKE AAMS N HIGHLA AAM S A B Inset Map 8, scale :,. K P 7, This product of the Ohio epartment of Natural Resources (ONR), ivision of Geological Survey is intended to provide a broad subsurface-geology framework and general information only and should not be used for any other purpose. It is not intended for resale or to replace site-specific investigations. These data were complied by the ONR ivision of Geological Survey, which reserves the publication rights to this material. If these data are used in the compilation of other data sets or maps for distribution or publication, this source must be referenced. Map No. G R E EN 6, GRANITE-RHYOLITE PROVINCE PTNAM Silurian GRENVILLE PROVINCE 6,683 4, GRANITE-RHYOLITE PROVINCE ELLIOTT 2, evonian FAY E T T E W AY N E sea level, Cambrian Contour on top of Precambrian. Contour intervals, 5, and, feet E CARTER 4,57, Pennsylvanian & Mississippian undivided Silurian & Ordovician undivided ROWAN Feet surface topography 2 5 NICHOLAS GERNSEY K SEE INSET MAP 9 3,9 FLEMING 2,22 Feet Precambrian monadnock or topographic high GILMER ,6 2,52 HARRISON KNOX Inset Map 6, scale :,. MASON LEWIS ROBERTSON ELAWARE Well location with elevation relative to sea level (where known) of Precambrian unconformity. A indicates where penetration of Precambrian rocks is uncertain. Wells added since Baranoski (22) shown in green. 7,95 L A W R E N C E GREENP MERCER SHELBY FRANK L I N LOGAN Location of seismic line used for interpretation (see table for identification) 5 5 INIANA G Contour line with hachures on lower side of contour 6,37 Y 2 Kilometers ROANE BRACKEN NION 5 3,64 GRANT AGLAIZE irectional well CALHON 3,83 PENLETON 5 Class II injection well 4,982 3,246 G A L L AT I N A RITCHIE 6 S C I O T O SWITZERLAN Class I injection well A 3, A A M S 35 2 Miles Fault or structural trend; dashed where inferred; short-dashed where fault displacement is questionable. Where throw not determined, (up)/ (down) symbols absent (see key to structural features) 6,38 2, ,3 B 8 B R O W N SEE INSET MAP 8 5 EXPLANATION WIRT 75 KENTON 2, ,3 M E I G S 6 BOONE 2,34 2,27 J A C K S O N PLEASANTS 4 5 P I K E 2, ,5 5 TYLER SCALE :5, C L E R M O N T 5 V I N T O N 4 26 A T H E N S 3 5, ,6 24 2,472 FAYETTE 3 R O S S ,292 H A M I L T O N 3,6 Inset Map 5, scale :,. H O C K I N G 3,959 2 H I G H L A N OHIO WETZEL,375 2,634 2,752 2,82 2,6 EARBORN 2,894 2,373 KNOX LICKING 9,24 2,3 SEE INSET MAP 7 2 3,4 2 2,58 GREENE N O B L E 7, E MARSHALL 5,474 2,284 OHIO M O R G A N 2,388 2,635 4 M O N R O E 2,47 B T L E R 8,8 P I C K A W A Y 2, ,984 7,78 P E R R Y 2,65 2,298 FAY E T T E 3,695 2,383 2 B E L M O N T COCORP OH- 7,348 MONTGOMERY 2,589 Inset Map 4, scale :,. BROOKE 2,598 2,375 ALLEGHENY WASHINGTON 6,445 4 P R E B L E 9,576 COCORP OH-2 M S K I N G M HOLMES COSHOCTON G E R N S E Y 6,67 4,98 4,398 7,557 L I C K I N G H A R R I S O N 6,53 C L A R K W AY N E 7,75 3,86 4 3,5 5,92 M A I S O N 2,22 RIPLEY 3,39 F R A N K L I N 4, 3,68 SEE INSET MAP 5 2,9 2,349 4,49 6,444 3,886 3,59 3,95 9 4,6 2,479 M I A M I HENRY 3,48 J E F F E R S O N C O S H O C T O N 52 3,35 2, HANCOCK 3,88 2,43 2,288 5,586 2,475 2, ,55 3,4 E L A W A R E 5,852 5,5 5,72 2, ,88 4 K N O X T S C A R A W A S 3,46 2,868 2,638 7,84 3,539 3,2 N I O N,989 2,3 S H E L B Y 2,986 2,34 3,284 2,87 2,664 3 HIGH LAN PIKE COCORP OH- 2,49 3 2,24 2,38 2 2,43 C A R R O L L H O L M E S,964 Inset Map 3, scale :,.,68 4,39 2, 2,5 J AY 3,472 LAWRENCE 9,6 M O R R O W M A R I O N 2,79 C O L M B I A N A BEAV ER,92 A G L A I Z E 5,577 3, ,3,932 S T A R K 5,44 8, ,282 M E R C E R,899 7,455 5,944 2,4 43 2, ,394,992 H A R I N BT 8,65 W A Y N E 2,98 8,448 7,659 I 6 C 28 R I C H LA N A L L E N 2,4 3,977 8,5 5 39, ,558 SANSKY,962 W Y A N O T L O R A I N A S H L A N J ,84 AAMS M A H O N I N G 2 8,24 46,986 6,44 3,37 9 Inset Map 2, scale :,. 8 5, ,675 3, ,687 W E R T V A N 8 2,6,94 2, ,3 2,53 2,3,843 8,476 M E I N A 5 H A N C O C K 2,667 3,698 5,38 2,7,727 3,723 P O R T A G E 6,63 S E N E C A 2,4 2,8 P T N A M H R O N S A N S K Y 7,83 S M M I T 5 7 2,62 MERCER 3,62 3,627 3,583 E R I E 4 ALLEN 9 5 2,96 CY AHOGA 2,889 2,69 2, ,663 P A L I N G 2,326 2,32 2,37 2,287 2,448 2,272 2,36 2,5 2, ,9 2,7 H 7 J 2 2,67 3 2, ,3 2, T R M B L L 5,67 2, 5 2,98 E F I A N C E LAKE 6,47 6,52 6,64 2,35 LAKE ERIE 5,566 H E N R Y 3 6,587 6 L A K E 3,8 5,745 5,757 G E A G A KELLEYS I. 2,866 Inset Map, scale :,. 5,95 5,5 LAKE 2,75 5,92 5,844 ASHTABLA 6,78 B TL E R WARREN W O O SOTH BASS I. 5,5 SEE INSET MAP 2 CRAWFOR 5, H ERIE 8 2,95 EKALB 5,322 5, ,384 MILE BASS I ,359 NORTH BASS I W. SISTER I. L C A S F L T O N 3,574 PELEE ISLAN W I L L I A M S WELLS ERIE 3,884 3,5 6,98 44 SEE INSET MAP 4 STEBEN 2,86 2,865 2,88 3,76 3 2,954 4,37 3,53 2,854 2,852 2,828 2,827 2,843 2,59 2,824 2,829 LAKE ERIE ,69 4,289 2,824 2,727 2,79 2,55 2, ,697 2, ,299 2,72 2,69 2,745 2, ,737 MONROE 9 LENAWEE 85 HILLSALE 4,759 BRANCH 5 4,529 4,485 O IOT E SC ENC R LAW K Inset Map 9, scale :,. EN OHIO TCKY