Stephen M. Mayer Gordon C. Baird Frederick M. Haynes

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1 HIGH RESOLUTION STRATIGRAPHY OF THE DEEP RUN SHALE MEMBER (MOSCOW FORMATION) ACROSS THE FINGER LAKES OF NEW YORK: A REINTERPRETATION OF BASIN AXIS DEPOSITION Stephen M. Mayer Gordon C. Baird Frederick M. Haynes

2 OBJECTIVES Identify and correlate isochronous beds within the Deep Run Shale Member using principles of high resolution stratigraphy Survey fossil species and abundance throughout the unit to infer paleoecological conditions and rates of sedimentation. Examine the western erosional truncation of the Deep Run Shale Member beneath the Menteth Limestone. Investigate previously undescribed Ludlowville- Moscow sections along the west shore of Seneca Lake and interpret their basinal trough deposition

3 Eleven-Mile Creek 2. Murder Creek 3. Jaycox Creek 4. Tichenor Gully 5. Menteth Gully 6. Deep Run Gully 7. Kashong Creek 8. Houston Rd. Gully 9. Shale banks along Seneca Lake 10. Indian Creek

4 West East Eleven-Mile Creek 2. Murder Creek 3. Jaycox Creek 4. Tichenor Gully 5. Menteth Gully 6. Deep Run Gully 7. Kashong Creek 8. Houston Rd. Gully after Baird, NYSM Bulletin Shale banks along Seneca Lake 10. Indian Creek

5 Eleven Mile Creek Jaycox Tichenor Deep Run Menteth Wanakah

6 Murder Creek Menteth limestone Menteth

7 DEEP RUN SHALE MEMBER JAYCOX CREEK, GENESSEE RIVER VALLEY DEEP RUN SHALE MEMBER MENTETH Erosional discontinuity WILLARD SILTSTONE Kipp Rd. Bed SHELL-RICH Tichenor SHELL-RICH WILLARD SILTSTONE SHELL-RICH Jaycox KIPP RD BED TICHENOR Jaycox

DEEP RUN SHALE MEMBER DEEP RUN SHALE MEMBER DEEP RUN

Erosional discontinuity 3M 2 1 0 MENTETH SHELL-RICH

SHELL-RICH WILLARD SILTSTONE 94 0 Erosional

8 DEEP RUN SHALE MEMBER DEEP RUN SHALE MEMBER DEEP RUN GULLY, CANANDAIGUA LAKE THK(CM) Erosional discontinuity 3M MENTETH SHELL-RICH WILLARD SILTSTONE Willard siltstone Menteth SHELL-RICH WILLARD SILTSTONE 94 0 Erosional discontinuity KIPP ROAD BED TICHENOR Jaycox Mbr. Kipp Road Bed

9 Trilobites from the Kipp Road Bed, Deep Run Shale Member A B Eldredgeops rana, Jaycox Creek C Eldredgeops rana, Green s landing Bellacartwrightia whiteleyi, Jaycox Creek

10 Camerate Crinoid holdfasts typical of the Kipp Road Bed

DEEP RUN SHALE MEMBER DEEP RUN SHALE MEMBER KASHONG GLEN,

SILTSTONE Kipp Road Bed 353 132 221 61 122 38 0 Localized

11 DEEP RUN SHALE MEMBER DEEP RUN SHALE MEMBER KASHONG GLEN, SENECA LAKE VALLEY THK(CM) Erosional discontinuity MENTETH SHELL-RICH Menteth 3M 2 WILLARD SILTSTONE Willard mid-falls WILLARD SILTSTONE Kipp Road Bed Localized Additional Beds Erosional discontinuity KIPP ROAD BED TICHENOR Jaycox Mbr. Tichenor Jaycox

12 BASAL DEEP RUN HOUSTON RD. GULLY, SENECA LAKE VALLEY Willard Kipp Rd. Bed Tichenor Jaycox

1115 3 1112 165 947 8 939 188 SHELL-RICH BED SHELL-RICH BED 751 46 705 624 SHELL-RICH BED

13 DEEP RUN SHALE MEMBER Willard Siltstone DEEP RUN SHALE MEMBER, HOUSTON RD., SENECA LAKE VALLEY THK(CM) Erosional discontinuity MENTETH Menteth Willard SHELL-RICH BED SHELL-RICH BED SHELL-RICH BED Interbedded crinoid-rich shale and recrystalline limestone Tichenor KIPP RD BED Erosional discontinuity TICHENOR Jaycox

14 Deep Run Shale Member, East Side of Seneca Lake near Willard, NY Menteth Willard siltstone Willard siltstone Kipp Rd. Bed

West East 7 8 9 10 1 2 3 4 5 6 1. Eleven-Mile Creek 2. Murder Creek 3. Jaycox Creek 4. Tichenor Gully 5. Menteth Gully 6.

15 West East Eleven-Mile Creek 2. Murder Creek 3. Jaycox Creek 4. Tichenor Gully 5. Menteth Gully 6. Deep Run Gully 7. Kashong Creek 8. Houston Rd. Gully after Baird, NYSM Bulletin Shale banks along Seneca Lake 10. Indian Creek

16 Willard siltstone Willard siltstone

17 West KIPP ROAD BED FOSSIL ASSEMBLAGES East Genesee Valley Canandaigua Valley Seneca Valley Turbidity increasing Water depth increasing Corals Favosites Heliophyllum Abundant, diverse Brachs Few Bivalves Grammysia Modiomorpha Corals Cystiphyllum Eridophyllum Fewer Brachs Some Bivalves Grammysia Modiomorpha Corals Eridophyllum Fewer Brachs Tropidoleptus Mucrospirifer Chonetids More Bivalves Paleoneilo Cypricardella Plethomytilus Modiomorpha Orthonata Goniophora

18 WILLARD SILTSTONE FOSSIL ASSEMBLAGES Rapid sedimentation and maximum water depths Barren to poorly fossiliferous Pervasive bioturbation Zoophycos spreiten Localized shell-rich horizons with low species diversity

19 Conclusions Deep Run Shale Member is an east-west trending muddy siltstone consisting of two regionally mappable units: a 1 m thick lower fossiliferous layer designated the Kipp Road Bed a 4-15 m thick sparsely fossiliferous upper unit designated the Willard siltstone Previously undescribed Ludlowville Moscow sections along the west shore of present-day Seneca Lake revealed new beds, which may have been deposited only in the central trough and are interpreted to be early stages of Tichenor deposition.

20 Conclusions The Kipp Road Bed is characterized by high species diversity and abundance, which decreases basinward due to increased bathymetry and turbidity. The Willard is typified by low species diversity and scarcity, which reflects rapid rates of sedimentation with intense bioturbation and maximum water depths. A few widely scattered very thin shell-rich horizons in the Willard contain many well-preserved in-situ fossils indicating a temporary slowing of sedimentation followed by renewed rapid burial. The uppermost strata of the Deep Run Shale Member exhibit coarse-grained layers which resemble ripplelike marks subjacent to the Menteth erosional surface.

FIELD STUDIES OF THE MIDDLE DEVONIAN LUDLOWVILLE-MOSCOW SEQUENCE IN THE GENESEE AND SENECA VALLEYS, NEW YORK STATE INTRODUCTION

FIELD STUDIES OF THE MIDDLE DEVONIAN LUDLOWVILLE-MOSCOW SEQUENCE IN THE GENESEE AND SENECA VALLEYS, NEW YORK STATE INTRODUCTION FELD STUDES OF THE MDDLE DEVONAN LUDLOWVLLE-MOSCOW SEQUENCE N THE GENESEE AND SENECA VALLEYS, NEW YORK STATE STEPHEN M. MAYER Department of Geology SUNY College at Fredonia Fredonia, NY 14063 NTRODUCTON