40Ar/39Ar geochronology of the Eocene Green River Formation, Wyoming

Bulletin of the Geological Society of America

Volumn 115, Issue 5, 2003, Pages 549-565

  Smith, M Elliot ^a   Singer, Brad ^a   Carroll, Alan ^a  

^a UNIVERSITY OF WISCONSIN MADISON   (United States)

Author keywords

40Ar 39Ar; Early eocene climate optimum; Green river formation; Lacustrine; Sedimentation rates; Wasatchian Bridgerian

Indexed keywords

TUFF BEDS;

ARGON; CONTAMINATION; REFRACTIVE INDEX;

GEOCHRONOLOGY;

ARGON-ARGON DATING; EOCENE; LACUSTRINE DEPOSIT; PALEOCLIMATE; SEDIMENTATION RATE; STRATIGRAPHIC CORRELATION; TUFF;

UNITED STATES;

EID: 0038661662     PISSN: 00167606     EISSN: None     Source Type: Journal    
DOI: 10.1130/0016-7606(2003)115<0549:AGOTEG>2.0.CO;2     Document Type: Article

References (136)

1. Ali, J.R., and Hailwood, E.A., 1998, Magnetostratigraphic (re) calibration of the Paleocene/Eocene broundary interval in Holes 550 and 549, Goban Spur, eastern North Atlantic: Earth and Planetary Science Letters, v. 161, p. 201-213.
2. Alroy, J., 1999, The fossil record of North American mammals: Evidence for a Paleocene evolutionary radiation: Systematic Biology, v. 48, p. 107-118.
3. Alroy, J., Koch, P.L., and Zachos, J.C., 2000, Global climate change and North American mammalian evolution: Paleobiology, v. 26, supplement, p. 259-288.
4. Anemone, R.L., 2001, New Paleogene faunas from the Great Divide Basin of southwestern Wyoming, in Climate and biota of the early Paleogene: International Meeting and Field Conference. Powell. Wyoming, 38 July: Washington, National Museum of Natural History, 2001, p. 2.
5. Aubry, M.-P., 1995, From chronology to stratigraphy: Interpreting the lower and middle Eocene stratigraphic record in the Atlantic Ocean, in Berggren, W.A., Kent, D.V., and Aubry, M.-P. and Hardenbol, J., eds., Geochronology, time scales, and global stratigraphic correlation: SEPM (Society for Sedimentary Geology) Special Publication 54, p. 213-274.
6. Aubry, M.-P, 1998, Stratigraphic (dis)continuity and temporal resolution of geologic events in the upper Paleocene-lower Eocene deep sea record, in Aubry, M.-P., Lucas, S., and Berggren, W.A., eds., Late Paleocene-early Eocene climatic and biotic events in the marine and terrestrial records: New York, Columbia University Press, p. 37-66.
7. Axelrod, D.I., 1968, Tertiary floras and topographic history of the Snake River Basin, Idaho: Geological Society of America Bulletin, v. 79, p. 713-734.
8. Beck, R.A., Vondra, C.F., Filkins, L.P., and Olander, J.D., 1988, Syntectonic sedimentation and Laramide basement thrusting. Cordilleran foreland: Timing of deformation, in Schmidt, C.J., and Perry, W.J., Jr., eds., Interaction of the Rocky Mountain foreland and the Cordilleran thrust belt: Geological Society of America Memoir 171, p. 465-487.
9. Berggren, W.A., and Aubrey, M.-P., 1996, A late Paleocene-early Eocene northwest Europe and North Sea magnetobiochronological correlation network, in Knox, R.W.O'B., Corfeld, R.M., and Dunay, R E., eds., Correlation of the early Paleogene in northwest Europe: Geological Society [London] Special Publication 101, p. 309-352.
10. Berggren, W.A., and Aubrey, M.-P., 1998. The Paleocene/Eocene Epoch/Series boundary: Chronostratigraphic framework and estimated geochronology. in Aubry, M.-P., Lucas, S., and Berggren, W.A., eds., Late Paleocene-early Eocene climatic and biotic events in the marine and terrestrial records New York. Columbia University Press, p. 18-36.
11. Berggren, W.A., Kent, D.V., Obradovich, J.D., and Swisher, C.C., III, 1992, Toward a revised Paleogene geochronology, in Prothero, D.R., and Berggren, W.A., Eocene-Oligocene climatic and biotic evolution: Princeton, New Jersey, Princeton University Press, p. 29-45.
12. Berggren, W.A., Kent, D.V., Swisher, C.C., III, and Aubry, M.-P., 1995, A revised Cenozoic geochronology and chronostratigrapby, in Berggren, W.A., Kent, D.V., Aubry, M.-P., and Hardenbol, J., eds., Geochronology time scales and global stratigraphic correlation: SEPM (Society for Sedimentary Geology) Special Publication 54, p. 129-212.
13. Bobst, A.L., Kowenstein, T.K., Jordan, J.E., Godfrey, L.V., Ku, T.-L., and Luo, S., 2001, A 106 ka paleoclimate record from drill core of the Salmar de Atacama, northern Chile: Palaeogeography, Palaeoeclimatology, Palaeoecology, v. 173, p. 21-42.
14. Bohacs, K.M., Carroll, A.R., Neal, I.E., and Mankiewicz, P.J., 2000, Lake-basin type, source potential, and hydrocarbon character: An integrated sequence-stratigraphic-geochemical framework, in Gierlowski-Kordesch, E.H., and Kelts, K.R., eds., Lake basins through space and time: American Association of Petroleum Geologists Studies in Geology 46, p. 3-34.
15. Bradley, W.H., 1929, The varves and climate of the Green River epoch: U.S. Geological Survey Professional Paper 158-E, 110 p.
16. Bradley, W.K., 1964, The geology of the Green River Formation and associated Eocene rocks in southwestern Wyoming and adjacent parts of Colorado and Utah: U.S. Geological Survey Professional Paper 496-A, 86 p.
17. Bryan, W.B., and Duncan, B.A., 1983, Age and provenance of clastic horizons from hole 516F, in Barker, P.F., and Johnson, D.A., Initial reports of the Deep Sea Drilling Project, Volume 72: Washington, D.C., Government Printing Office, p. 475-477.
18. Buchheim, H.P., 1994, Paleoenvironment, lithofacies, and varves of the Fossil Butte Member of the Eocene Green River Formation, southwest Wyoming: University of Wyoming Contributions to Geology, v. 30, no. 1, p. 3-14.
19. Buchheim, H.P., and Eugster, H.P., 1998, Eocene Fossil Lake: The Green River Formation of Fossil Basin, southwestern Wyoming, in Pitman, J.K., and Carroll, A.R., eds., Modern and ancient lake systems: New problems and perspectives: Utah Geological Assocation Publication 26, p. 191-208.
20. Cande, S.C., and Kent, D.V., 1992, A new geomagnetic polarity timescale for the Late Cretaceous and Cenozoic Journal of Geophysical Research, v. 100, p. 13,917-13,951.
21. Cande, S.C., and Kent, D.V., 1995, Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic: Journal of Geophysical Research, v, 100, p. 6093-6095.
22. Carroll, A.R., and Bohacs, K.M., 1999, Stratigraphic Classification of ancient lakes: Balancing tectonic and climatic controls Geology, v. 27, p. 99-102.
23. Carroll, A.R., and Bohacs, K.M., 2001, Lake-type controls on petroleum source rock potential in nonmarine basins: American Association of Petroleum Geologists Bulletin, v. 85, p. 1033-1053.
24. Clyde, W.C., Sheldon, N.D., Koch, P.L., Gunnell, G.F., and Bartels, W.S., 2001, Linking the Wasatchian/Bridgerian boundary to the Cenozoic global climate optimum: New magnetostratigraphic and isotopic results from South Pass, Wyoming: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 167, p. 175-199.
25. Clyde, W.C., Stamatakos, J., and Gingerich, P.D., 1994, Chronology of the Wasatchian land-mammal age (early Eocene): Magnetostratigraphic results from the McCullough Peaks section, northern Bighorn Basin, Wyoming: Journal of Geology, v. 102, p. 367-377.
26. Clyde, W.C., Zonneveld, J-P., Stamatakos, J., Gunnell, G.F., and Bartel, W.S., 1997, Magnetostratigraphy across the Wasatchian/Bridgerian NAMLA boundary (early to middle Eocene) in the western Green River Basin, Wyoming: Journal of Geology, v. 105, p. 657-669.
27. Crowley, K.D., Duchon, C.E., and Rhi, J., 1986, Climate record in varved sediments of the Green River Formation: Journal of Geophysical Research, v. 91, p. 8637-8647.
28. Culbertson, W.C., 1961, Stratigraphy of the Wilkins Peak Member of the Green River Formation, Firehole Basin Quadrangle, Wyoming: U.S. Geological Survey Professional Paper 424D, p. 170-173.
29. Culberston, W.C., 1998, Road log for the geology field trip of June 13, 1997, Geology and outcrops of the trona-bearing rocks of the Green River Formation: Wyoming State Geological Survey Public Information Circular 40, p. 205-211.
30. Dalrymple, G.B., 1979, Critical tables for conversion of K-Ar ages from old to new constants: Geology, v. 7, p. 558-560.
31. DeCelles, P.G., 1994, Late Cretaceous-Paleocene synorogenic sedimentation and kinematic history of the Sevier thrust belt, northeast Utah and southwest Wyoming: Geological Society of America Bulletin, v. 106, p. 32-56.
32. 39Ar dating of the Olorgesailie Formation, southern Kenya Rift: Journal of Geophysical Research, v. 95, 8453-8470.
33. Desborough, G.A., 1975, Authigenic albite and potassium feldspar in the Green River Formation. Colorado and Wyoming: American Mineralogist, v. 60, p. 235-239.
34. Dott, R.H., Jr., 1983, Episodic sedimentation: How normal is average? How rare is rare? Does it matter?: Journal of Sedimentary Petrology, v. 53, p. 5-23.
35. Duffield, W.A., and Dalrymple, G.B., 1990, The Taylor Creek Rhyolite of New Mexico: A rapidly emplaced field of Java domes and flows: Bulletin of Volcanology, v. 52, p. 475-487.
36. Elston, D.P., Lantos, M., and Hamor, T., 1994, High resolution polarity records and the stratigraphic and magnetostratigraphic correlation of late Miocene and Pliocene (Pannonian, s.l.) deposits of Hungary, in Teleki, P.G., Mattick, R.E., and Kókai, J., eds., Basin analysis and petroleum exploration: Dordrecht, Netherlands, Kluwer Academic Publishers, p. 111-142.
37. Ensley, R.A., and Verosub, K.L., 1982, A magnetostratigraphic study of the sediments of the Ridge Basin, southern California and its tectonic and sedimentologic implications: Earth and Planetary Science Letters, v. 59, p. 192-207.
38. Eugster, H.P., and Hardie, L.A., 1975, Sedimentation in an ancient playa lake complex, the Wilkins Peak Member of the Green River Formation of Wyoming: Geological Society of America Bulletin, v. 86, p. 319-334.
39. Evanoff, E., Brand, L.R., and Murphey, P.C., 1998, Bridger Formation (middle Eocene) of southwest Wyoming: Widespread marker units and subdivisions of Bridget B through D: Dakoterra, v. 5, p. 115-122.
40. Evernden, JL.F., Savage, D.E., Curtis, G.H., and James, G.T., 1964, Potassium-argon dates and the Cenozoic mammalian chronology of North America: American Journal of Science, v. 262, p. 145-198.
41. Feeley, T.C., Lindsay, C.R., and Cosca, M.A., 1999, Timing and compositional evolution of magmatism at the Sunlight volcano, Absaroka volcanic province, Wyoming: Geological Society of America Abstracts with Programs, v. 31, no. 7, p. 165.
42. Fischer, A.G., and Roberts, L.T., 1991, Cyclicity in the Green River Formation (lacustrine Eocene) of Wyoming: Journal of Sedimentary Petrology, v. 61, p. 1146-1154.
43. Flynn, J.J., 1986, Correlation and geochronology of middle Eocene strata from the western United States: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 55, p. 335-406.
44. Flynn, J.J., and Tauxe, L., 1999, Magnetostratigraphy of upper Paleocene-lower Eocene marine and terrestrial sequences. in Aubry, M.-P., Lucas, S., and Berggren, W.A., eds., Late Paleocene-early Eocene climatic and biotic events in the marine and terrestrial records: New York, Columbia University Press, p. 67-90.
45. th Annual Field Conference, p. 171-190.
46. Goodwin, J.H., 1973, Analcime and K-feldspar in tuffs of the Green River Formation, Wyoming: American Mineralogist, v. 58, 93-105.
47. Goodwin, J.H., and Surdam, R.C., 1967, Zeolitization of tuffaceous rocks of the Green River Formation, Wyoming: Science, v. 157, p. 307-308.
48. Greenwood, D.R., and Wing, S.L., 1995, Eocene continental climates and latitudinal temperature gradients: Geology, v. 23, p. 1044-1048.
49. 39Ar geochronology and paleomagnetism of Independence volcano, Absaroka Volcanic Supergroup, Bear-tooth Mountains, Montana: Canadian Journal of Earth Sciences, v. 33, p. 1648-1654.
50. Hay, R.L., 1966, Zeolites and zeolitic reactions in sedimentary rocks: Geological Society of America Special Paper 85, 130 p.
51. Hiza, M.M., 1999, The geochemistry and geochronology of the Eocene Absaroka volcanic province, northern Wyoming and southern Montana, USA [Ph.D. thesis]: Corvallis, Oregon State University, 243 p.
52. Holroyd, P.A., and Smith, K.T., 2000, Preliminary biostratigraphic evidence for age of the Wasatch and Green River Formations, Washakie Basin, southwestern Wyoming: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. 498.
53. Honey, J.G., 1988, A mammalian fauna from the base of the Eocene Cathedral Bluffs Tongue of the Wasatch Formation, Cottonwood Creek area. southeast Wasatch Basin, Wyoming: U.S. Geological Survey Bulletin 1669C, p. 1-14.
54. Iijima, A., and Hay, R.L., 1968, Analcime composition in tuffs of the Green River Formation: American Mineralogist, v. 53, p. 184-200.
55. Isoplatov, V.O., Dudas, F.O., Snee, L.W., and Harlan, S.S., 1996, Precise dating of the Lowland Creek volcanics, west-central Montana: Geological Society of America Abstracts with Programs, v. 28, no. 7, p. 484.
56. Janecke, S.U., and Snee, L.W., 1993, Timing and episodicity of middle Eocene volcanism and onset of conglomerate deposition, Idaho: Journal of Geology, v. 101, p. 603-621.
57. 39Ar geochronology of Roman province tephra in the Tiber River valley: Age calibration of middle Pleistocene sea level changes: Geological Society of America Bulletin, v. 110, p, 740-747.
58. Königer, S., and Stollhofen, H., 2001, Environmental and tectonic controls on preservation potential of distal fallout ashes on fluvio-lacustrine settings: The Carboniferous-Permian Saar-Nahe Basin, south-west Germany, in White, J.D.L., and Riggs, N.R., eds., Volcaniclastic sedimentation in lacustrine settings: International Association of Sedimentologists Special Publication 30, p. 263-284.
59. 39Ar age calculations: Computers and Geoscience, v. 28, p. 605-619.
60. Krishtalka, L., West, R.M., Black, C.C., Dawson, M.R., Flynn, J.J., Turnbull, W.D., Stucky, R.K., McKenna, M.C., Bown, T.M., Golz, D.J., and Lillegraven, J.A., 1987, Eocene Wasatchian through Duchesnean) biochronology of North America, in Woodburne, M.O., ed., Cenozoic mammals of North America, Geochronology and biostratigraphy: Berkeley, University of California Press, p. 77-117.
61. Krogh, T.E., 1982, Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique: Geochimica et Cosmochimica Acta, v. 46, J, 637-649.
62. Ku, T.-L., Luo, S., Lowenstein, T.K., Li, J., and Spencer, R.J., 1998, U-series chronology of lacustrine deposits in Death Valley, California: Quaternary Research, v. 50, p. 261-275.
63. 39Ar, Rb-Sr and U/Pb mineral ages from the 27.5 Ma Fish Canyon Tuff reference standard; Chemical Geology, v. 175, p. 653-691
64. 39Ar fluence monitors: U.S. Geological Survey Professional Paper 1621, 10 p.
65. Lipman, P.W., 2000, Central San Juan caldera cluster: Regional volcanic fromework, in Bethke, P.M., and Hay, R.L., eds., Ancient Lake Creede: Its volcano-tectonic setting, history of sedimentation, and relation to mineralization in the Creede mining district: Geological Society of America Special Paper 346, p. 9-69.
66. Love, J.D., and Christiansen, A.C., 1985, Geologic map of Wyoming: U.S. Geological Survey, scale 1:500,000.
67. Lucas, S.G., 1999, Fossil mammals and the Paleocene/Eocene series boundaries in Europe, North America, and Asia, in Aubry, M.-P., Lucas S., and Berggren, W.A., eds., Late Paleocene-early Eocene climatic and biotic events in the marine and terrestrial records: New York, Columbia University Press, p. 451-500.
68. Marvin, R.F., Hearn, B.C., Jr., Menhert, H.H., Naeser, C.W., Zartman, R.E., and Lindsey, D.A., 1980, Late Cretaceous-Paleocene-Eocene igneous activity in north-central Montana: Isochron/West, v. 29, p. 5-25.
69. Markwick, P.J., 1994. "Equability," continentality, and Tertiary "climate": The crocodolian perspective: Geology, v. 22, p. 613-616.
70. Matthews, M.D., and Perlmutter, M.A., 1994, Global cyclostratigraphy: An application to the Eocene Green River Basin, in de-Boer, P.L., Smith, D.G., eds., Orbital forcing and cyclic sequences: International Association of Sedimentologists Special Publication 19, p. 459-481.
71. Mauger, R.L., 1977, K-Ar ages of biotites from tuffs in Eocene rocks of the Green River, Washakie, and Uinta basins, Utah, Wyoming, and Colorado: University of Wyoming Contributions to Geology, v. 15, no. 1, p. 17-41.
72. McCarroll, S.M., Flynn, J.J., and Turnbull, W.D., 1996, Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation. Washalkie Basin, Wyoming, in Prothero, D.R., and Emry, R.J., eds., The terrestrial Eocene-Oligocene transition in North America: Cambridge, Cambridge University Press, p. 25-39.
73. 39Ar ages using HIFAR reactor: Geological Society of Australia Journal, v. 21, p. 81-89.
74. 39Ar ages of some Challis volcanic group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana: U.S. Geological Survey Bulletin 2132, p. 1-17.
75. McGrew, P.O., and Roehler, H.W., 1960, Correlation of Tertiary units in southwestern Wyoming, in Overthrust belt of southwestern Wyoming and adjacent areas: Casper, Wyoming Geological Association Guidebook, 15th Annual Field Conference, p. 157-158.
76. 399Ar geochronology through comparison with U/Pb analysis of a 1.1-Ga rhyolite: Geochimica et Cosmochima Acta, v. 64, p. 73-98.
77. Morris, W.J., 1954, An Eocene fauna from the Cathedral Bluffs Tongue of the Washakie Basin: Journal of Paleontology, v. 28, p. 195-203.
78. 39Ar dating of volcanic ash deposits in the Bridger Formation (middle Eocene), southwestern Wyoming: Geological Society of America Abstracts with Programs, v. 31, no. 7, p. 233.
79. Obradovich, J.D., and Hicks, L.F., 1999, A review of the isotopic calibration points for the geomagnetic polarity time scale, in the interval 83-33 Ma (C34n to C13n); Geological Society of America Abstracts with Program, v. 31, no, 7, p. 71.
80. Olsen, P.E., 1986, A 40-million-year lake record of early Mesozoic orbital climatic forcing: Science, v. 234, p. 842-848.
81. 39Ar ages of selected tuff of the Green River Formation: Wyoming, Colorado, and Utah [M.Sc. thesis]: Columbus, Ohio State University, 142 p.
82. Palmer, B.A., and Shawkey, E.P., 1997, Lacustrine sedimentation processes and patterns during effusive and explosive volcanism, Challis volcanic field, Idaho: Journal of Sedimentary Research, v. 67, p. 750-774.
83. Pietras, J.T., Carroll, A.R., and Rhodes, M.K., 2003, Tectonic control an lacustrine evaporite deposition in the Eocene Green River Formation, Wyoming: Journal of Paleolimnology (in press).
84. Prothero, D.R., 1996a. Magnetic stratigraphy and biostratigraphy of the middle Eocene Uinta Formation, Uinta basin, Utah, in Prothero, D.R., and Emry, R.J., eds., The terrestrial Eocene-Oligocene transition in North America: Cambridge, Cambridge University Press, p. 3-22.
85. Prothero, D.R., 1996b, Summary, in Prothero, D.R., and Emry, R.J., ed., The terrestrial Eocene-Oligocene transition in North America: Cambridge, Cambridge University Press, p. 664-683.
86. Prothero, D.R., and Swisher, C.C., III., 1992, Magnetostratigraphy and geochronology of the terrestrial Eocene-Oligocene transition in North America, in Prothero, D.R., and Berggren, W.A., eds., Eocene-Oligocene climatic and biotic evolution: Princeton, New Jersey, Princeton University Press, p. 46-73.
87. Ratterman, N.G., and Surdam, B.C., 1981, Zeolite mineral reactions in a tuff in the Laney Member of the Green River Formation, Wyoming: Clays and Clay Minerals, v. 29, p. 365-377.
88. Reed, W.E., and Oertel, G., 1978, Is compaction a factor in organic diagenesis?: Geological Society of America Bulletin, v. 89, p. 658-662.
89. Renne, P.R., Deino, A.L., Walter, B.C., Turrin, B.D., Swisher, C.C., Becker, T.A., Curtiss, G.H., and Jaouni, A. R., 1994, Intercalibration of astronomical and radio-isotopic time: Geology, v. 22, p. 783-786.
90. 39Ar dating: Chemical Geology, v. 145, p. 117-152.
91. Rhodes, M.R., Carroll, A.R., Pietras, J.T., Beard, B.L., and Johnson, C.M., 2002, Strontium isotopic record of paleohydrology and continental weathering, Eocene Green River Formation, Wyoming: Geology, v. 30, p. 167-170.
92. Ripepe, M., Roberts, L.T,, and Fischer, A.G., 1991, Enso and sunspot cycles in varved Eocene oil shales from image analysis: Journal of Sedimentary Petrology, v. 61, p. 1155-1163.
93. Roehler, H.W., 1989, Correlation of surface sections of the intertongued Eocene Wasatch and Green River Formations along the western margin of the Greater Green River Basin in southwest Wyoming: U.S. Geological Survey Miscellaneous Field Studies Map MF-2103.
94. Roehler, H.W., 1991, Identification of oil shale and trona beds and their geophysical-log responses in Energy Research and Development Administration Black Fork No. 1 corehole, Eocene Green River Formation, southwest Wyoming: U.S. Geological Survey Miscellaneous Field Studies Map MF-2158.
95. Roehler, H.W., 1992a, Description and correlation of Eocene rocks in stratigraphic reference sections for the Green River and Washakie basins, southwest Wyoming: U.S. Geological Survey Professional Paper 1506-D, 83 p.
96. Roehler, H.W., 1992b, Correlation, composition, areal distribution, and thickness of Eocene stratigraphic units, greater Green River basin, Wyoming, Utah, and Colorado, U.S. Geological Survey Professional Paper 1506-E, 49 p.
97. Roehler, H.W., 1993, Eocene climates, depositional environments, and geography, greater Green River basin. Wyoming, Utah, and Colorado: U.S. Geological Survey Professional Paper 1506-F, 74 p.
98. 39Ar dating standard, MMhb-1: Chemical Geology, v. 66, p. 27-34.
99. Schmincke, H.-U., and van den Bogaard, P., 1991, Tephra layers and tephra events, in Einsele, G., Ricken, W., and Seilacher, A., eds., Cycles and events in stratigraphy: Berlin, Springer-Verlag., p. 392-429.
100. Schmitz, M.D., and Browning, S.A., 2001, U-Pb zircon and titanite systematics of the Fish Canyon Tuff. An assessment of high-precision U-Pb geochronology and its application to young volcanic rocks: Geochimica et Cosmochimica Acta, v. 65, p. 2571-2587.
101. Sewall, J.O., Sloan, L.C., Huber, M., and Wing, S., 2000, Climate sensitivity to changes in land surface characteristics: Global and Planetary Change, v. 26, p. 445-165.
102. Shackleton, N.J., 1986, Paleogene stable isotope events: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 57, p. 91-102.
103. Sheppard, B.A., and Gude, A.L., 1969, Diagenesis of tuffs in the Barstow Formation, Mud Hills, San Bernardino County, California: U.S. Geological Survey Professional Paper, 634, 35 p.
104. Sheriff, S.D., and Shive, P.N., 1982, Unreliable Paleomagnetic results from the Wilkins Peak Member of the Eocene Green River Formation: Geophysical Research Letters, v. 9, p. 723-726.
105. 39Ar and paleomagnetic results from the Valles rhyolite near Jaramillo Creek, Jemez Mountains, New Mexico, From and Planetary Science Letters, v. 197, p. 51-64.
106. Smedes, H.W., and Prostka, H.J., 1972, Stratigraphic framework of the Absaroka Volcanic Supergroup in the Yellowstone National Park region: U.S. Geological Survey Professional Paper 729-C, 33 p.
107. 39Ar geochronology and cyclostratigraphy of the Green River Formation: Testing micro- and meso-scale climate forcing: Eos (Transactions, American Geophysical Union), v. 82, p. p. F1141.
108. Smoot, J.P., 1983, Depositional subenvironments in an arid closed basin: The Wilkins Peak Member of the Green River Formation (Eocene), Wyoming, U.S.A.: sedimentology, v. 30, p. 801-827.
109. 39Ar age-spectrum and conventional K/Ar dates for unaltered plutons: U.S. Geological Survey Open-File Report OF82-961, 20 p.
110. Snider, L.G., and Moye, F.J., 1989, Regional stratigraphy, physical volcanology, and geochemistry of the southeastern Challis volcanic field: U.S. Geological Survey Open File Report OF89-639, p. 122-127.
111. Sparks, R.S.J., Bursik, M.I., Carey, S.N., Gilbert, J.S., Glaze, L.S., Sigurdsson, H., and Woods, A.W., 1997, Volcanic plumes: New York, John Wiley and Sons, 574 p.
112. Steidtmann, J.R., and Middleton, L.T., 1991, Fault chronology and uplift history of the southern Wind River Range, Wyoming: Implications for Laramide and post-Laramide deformation in the Rocky Mountain foreland Geological Society of America Bulletin, v. 103, p. 472-485.
113. Steiger, R.H., and Jäger, E., 1977, Subcommission on geohronology: Convention on the use of decay constants in geo- and cosmochronology: Earth and Planetary Science Letters, v. 36, p. 359-362.
114. Stucky, R., 1990, Evolution of land mammal diversity in North America during the Cenozoic: Current Mammalogy, v. 2, p. 375-432.
115. Sullivan, R., 1985, Origin of lacustrine rocks of the Wilkins Peak Member, Wyoming: American Association of Petroleum Geologists Bulletin, v. 69, p. 913-922.
116. Sundell, K.A., 1993, A geologic overview of the Absaroka volcanic province. in Snoke, A.W., Steidtmann, J.R., and Roberts, S.M., eds., Geology of Wyoming: Larande, Wyoming, Geological Survey of Wyoming Memoir 5, p. 480-506.
117. Surdam, K.A., and Parker, R.D., 1972, Authigenic aluminosilicate minerals in the tuffaceous rocks of the Green River Formation. Wyoming: Geological Society of America Bulletin, v. 83, p. 689-700.
118. Surdam, R.C., and Stanley, K.O., 1979. Lacustrine sedimentation during the culminating phase of Eocene Lake Gosiute, Wyoming (Green River Formation): Geological Society of America Bulletin, v. 90, p. 93-110.
119. Surdam, R.C., and Stanley, K.O., 1980, Effects of changes in drainage-basin boundaries on sedimentation in Eocene Lakes Gosiute and Uinta of Wyoming. Utah, and Colorado: Geology, v. 8, p. 135-139.
120. 39Ar daring of the lower part of NP10, North Sea Basin and Denmark, in IGCP Project 308 (Paleocene/Eocene boundary events): International Geological Correlation Programme, International Annual Meeting and Field Conference, Brussels, 2-6 December, 1991: Paris, Abstracts with Program, p. 16.
121. Tauxe, L., Gee, J., Gallet. Y., Pick, T., and Bown, T., 1994, Magnetostratigraphy of the Willwood Formation, Bighorn Basin, Wyoming: New constraints on the location of Paleocene/Eocene boundary: Earth and Planetary Science Letters, v. 125, p. 159-172.
122. Taylor, J.R., 1982. An introduction to error analysis: Mill Valley, California, University Science Books, 270 p.
123. 39Ar dating of latest Pleistocene (41 ka) marine tephra in the Mediterranean Sea: Implications for global climate records: Each and Planetary Science Letters, v. 184, p. 645-658.
124. Townsend, H.A., 1985, The paleomagnetism of sediments acquired from the Goban Spur on the Deep Sea Drilling Project Leg 80, in de Graciansky, P.C., Poag, C.W., et al., eds., Initial reports of the Deep Sea Drilling Project, Volume 80: Washington, D.C., Government Printing Office, p. 389-410.
125. Van Houten, E.B., 1962, Cyclic lacustrine sedimentation and the origin of analcime-rich Upper Triassic Lock-along Formation, west-central New Jersey and adjacent Pennsylvania American Journal of Science, v. 260, p. 561-576,
126. 39Ar ages in the Phanerozoic Geochimica et Cosmochima Acta. v. 64, p. 4017-4030.
127. West, R.M., and Dawson. M.R., 1973, Fossil mammals from the upper part of the Cathedral Bluffs Tongue of the Wasatch Formation (early Bridgerian), northern Green River Basin, Wyoming: University of Wyoming Contributions to Geology, v. 12, no. 1, p. 33-41.
128. Wilf, P., 2000, Late Paleocene-early Eocene climate changes in southwestern Wyoming: Paleobotanical analysis: Geological Society of America Bulletin, v. 112, p. 292-307.
129. Wilf, P., Wing, S.L., Greenwood, D.R., and Greenwood, C.L., 1998, Using fossil leaves as paleoprecipitation indicators: An Eocene example: Geology. v. 26, p. 203-206.
130. Wing, S.L., Bao, H., and Koch, P.L., 2000, An early Eocene cool period? Evidence for continental cooling during the warmest part of the Cenezoic, in Huber, B.T., Macleod, K.G., and Wing, S.L., eds., Warm climates in Earth history: Cambridge, Cambridge University Press, p. 197-237.
131. Wing, S.L., Bown, T.M., and Obradovich, J.D., 1991, Early Eocene biotic and climatic change in interior western North America: Geoldgy, v. 19, p. 1189-1192.
132. Wood, H.E., Chaney, R.W., Clark, J., Colbert, E.H., Jepson, G.L., Reedside, J.B., and Stock, C., 1941, Nomenclature and correlation of the North American continental Tertiary: Geological Society of America Bulletin, v. 52, p. 1-48.
133. York, D., 1969, Least squares fitting of a straight line with correlated errors Earth and Planetary Science Letters, v. 5, p. 320-324.
134. Zachos, J., Pagani, M., Sloan, L., Thomas, E., and Billups, K., 2001, Trends, rhythms, and aberrations in global climate 65 Ma to present: Science, v. 292, p. 685-693.
135. Zachos, J.C., Stott, L.D., and Lohmann, K.C., 1994, Evolution of early Cenozoic marine temperatures: Paleoceanography, v. 9, p. 353-387.
136. Zonneveld, J.-P., Gunnell, G.F., and Bartels, W.S., 2000, Early Eocene fossil vertebrates from the Southwestern Green River Basin, Lincoln and Uinta Counties, Wyoming: Journal of Vertebrate Paleontology, v. 20, p. 369-386.