Data Repository item DATA REPOSITORY
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1 Data Repository item DATA REPOSITORY Stable isotope and trace-element geochemistry of the basal Bouse Formation carbonate, southwestern USA: Implications for the Pliocene uplift history of the Colorado Plateau Simon R. Poulson Department of Geological Sciences, MS 172, University of Nevada-Reno, Reno, Nevada 89557, U.S.A. Barbara E. John Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, U.S.A. SAMPLE LOCATION AND DESCRIPTIONS (samples listed geographically from north to south) Lost Cabin Wash, Arizona BS-14b 'N, 'W (Spirit Mtn.SE, AZ-NV 7.5 quadrangle); 1440 (sampled on north side of wash) Bedding 005 /4 W (toward the basin interior). Sample from 18 cm thick, well-lithified micritic carbonate. Small, 1-2 cm plant or algal fragments locally preserved (Turak, 2000). BS 'N, 'W (Spirit Mtn.SE, AZ-NV 7.5 quadrangle); 1240 Horizontal bedding. Sample collected 60 cm from base of section; massive micritic carbonate, overlain by, and interstratified with planar laminated siliciclastic mud. No fossils present. Silver Creek Wash, Arizona BS-12d 'N, 'W (Oatman AZ 7.5 quadrangle); 1795 Sample of thin bedded marl from 15 cm above base of 1.5-3m thick section. Parallel laminated marl interstratified with cm thick beds of bioturbated (?) sand, near the top of the exposed section. Rare gastropod and bivalve fragments noted at 50, 100 and 290 cm above the basal shales (Turak, 2000). BS-12e ' N, ' W (Oatman AZ 7.5 quadrangle); (1693 ) Sample of very rough tufa mantling volcanic bedrock, ~6-8 meters above Silver Creek Wash (sampled from north side of wash). Tufa up to ~1.5 meters thick, may be locally
2 Data Repository item silicifed, and drapes over 5-7 meters of topography. No laminations, tubules or other structures evident in outcrop. Sample equivalent to Spencer and Patchett (1997) sample #96BS-23. Northern Sacramento Mountains, California BS 'N, 'W (Bannock, CA 7.5 quadrangle); 1509 Sample of cm thick, well-laminated marl, from ~ 5 cm above base. No fossils present. Needles area, California EC96-22 (E. Sacramento Mountains, CA) 'N, 'W (Whale Mountain, CA-AZ 7.5 quadrangle); 925 Bedding dips 14 E (into the basin). Sample of 60 cm thick, laminated marl, with detrital biotite. No fossils present. Bouse-1 (Park Moabi, CA) 'N, 'W (Whale Mountain, CA-AZ 7.5 quadrangle); 680 Sample of cm thick, well-laminated marl, from ~ 4 cm above the sharp base. Flaggy character of the carbonate due to a high percentage of shale. Host to numerous lithic fragments to ~5-8 mm. No fossils present. Bouse-2 (E. Sacramento Mountains, CA) 'N, 'W (Monumental Pass, CA 7.5 quadrangle); 1120 Bedding dips 5 E (into the basin). Sample of <2 meter thick, massive micritic carbonate, with rare detrital biotite grains (to 0.5 mm). No fossils present. Chemehuevi Wash, California BS 'N, ' W (Havasu Lake, CA 7.5 quadrangle); 867 Subhorizontal dip. Sample of v. fine grained, flaggy white carbonate mud, with shaley laminations ~2-5 cm thick, locally with lithic fragments up to several centimeters in diameter. No fossils present. Section grades upward into pink, quartz-rich silt. BS 'N, 'W (Havasu Lake, CA 7.5 quadrangle); 640 Poorly defined bedding oriented 175 /5 E (toward the basin interior). Four samples taken from > 3 meter thick (basin fill section), massive micritic carbonate with >90% carbonate. Section poorly laminted, with partings ~20-30cm, that grades upward into greenish-yellowish silts with gypsiferous horizons. Shale content increases upward through the entire 4-5 meter section. Interbedded carbonate-rich shale and shale are exposed at the top of the section (Turak, 2000).
3 Data Repository item BS-11a Sample of slightly resistant, massive marl from 50 cm above base of 2m thick marl. No fossils present. BS-11b Sample of marl from 150 cm above base of 2m thick marl. No fossils present. BS-11c Sample of marl from weakly, parallel laminated section (above 2 m section of massive micritic carbonate, collected ~250 cm above base of Bouse), with mud interlayers ~1-2 cm thick. No fossils present. BS-11d Sample of carbonate silt/clay, collected ~290 cm above base of the Bouse. No fossils present. Earp area, north of Parker, Arizona Bouse-3 (NW of Earp, CA) 'N, 'W (Parker, CA-AZ 7.5 quadrangle); 508 Well-defined bedding dips 2 E (toward the basin interior). Sample from thinly laminated marl up to 1 m thick, above yellowish-stained alluvial deposits. Osborn Wash, Arizona Subhorizontal bedding. Section at sample site up to ~1 meter thick; basal 15 cm, massive, overlain by finely ( cm thick) laminated carbonate. Carbonate fairly pure with little detrital component except at base. BS-9a 'N, 'W (Crossroads CA-AZ 7.5 quadrangle); 440 Sample from massive, base of marl layer. BS-9b 'N, 'W (Crossroads CA-AZ 7.5 quadrangle); 440 Sample from thinly laminated marl, with ostracods. Limekiln Wash (SE of Ehrenberg), Arizona BS-7 (Limekiln Wash, AZ) 'N, 'W (Dome Rock Mtns, SW AZ 7.5 quadrangle); 750 Sample of masssive, mound-like tufa with resistant silica-rich zones, and little interstratified detrital material. Deposit drapes over > 15 meters of topography locally. BS-8 (Limekiln Wash, AZ) 'N, 'W 33'W (Dome Rock Mtns, SW AZ 7.5 quadrangle); 640
4 Data Repository item Subhorizontal bedding. Sample of 15m thick section of massive (poorly laminated) carbonate and with shelly horizons. Layering on the scale of cm. Milpitas Wash/Palo Verde Mountains area, California Sample site bedding oriented 010 /13 W, with dip gently into erosional slope. Overall exposed thickness ~3.6 meters; base of the Bouse Formation not exposed. Lowest exposed Bouse is fine-grained, laminated carbonate with cm planar bedding with minor, locally derived clastic material. Middle of section, thicker bedded to 6-8 cm. Upper 1 meter with coarse volcanic detritus to 4-6 cm) BS-4a Sample of marl collected 8cm from top of exposed section; contains numerous volcanic clasts to ~10 cm. BS-4b Sample of marl collected 90cm from top of exposed section; massive bedding to ~4cm thick. BS-4c Sample of marl collected 200 cm from top of exposed section; recessive, thick (6-8 cm partings) bedded carbonate. BS-4d Sample of laminated marl collected 350 cm from top of exposed section; bedding ~2-3 cm thick. Milpitas Wash, east of CA 78, California Sample site bedding oriented 024 /8 W, with dip gently into basin center. Overall exposed thickness ~33 meters (~ten times thicker than exposed section to the north of the basin at BS-4); base and top of the Bouse Formation not exposed. Lowest exposed Bouse is fine-grained, laminated carbonate with 2-8 cm planar bedding. Top of the section characterized by low-angle planar cross-beds up to ~15cm across. Section grades from very high proportion of carbonate upward to more clastic-rich towards unexposed top. BS-6a Sample of clastic limestone (barnacle cochina) from ~10 cm above base of the exposed section. BS-6b
5 Data Repository item Sample of laminated, clastic limestone (barnacle, gastropods and lithic-rich carbonate) from top of exposed section (~5 meters above base of the exposed section). Top of section characterized by meter-scale low angle cross-bedding. BS-6c Clastic limestone, with high porosity (~10 meters above base of the exposed section). Rich in shell material (gastropods, other unidentified material). BS-6d Clastic limestone, with high porosity (~20 meters above base of the exposed section). Rich in shell material (gastropods, other unidentified material). Buzzards Peak area, Chocolate Mountains, California BS 'N, 'W (Buzzards Peak, CA 7.5 quadrangle); 1000 Sample from poorly exposed, rubbly outcrop of finely laminated marl, with detrital biotite grains to ~0.5mm, and ostracods.
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