Jim Trexler

LMR-357
Phone: 775-784-1504
E-mail: trexlermines.unr.edu

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Education:
University of Maryland, B.S. in Geology
University of Oklahoma, M.S. in Geology
University of Washington, Ph.D. in Geology

Research Interests:
My research concentrates on basin analysis, with a focus on tectonic history as recorded by basin stratigraphy. Currently, I am working in two areas:

• Late Paleozoic tectonic history of the Great Basin . I am working in strata of the upper Paleozoic, elucidating the complex tectonic history of the margin of North America after the Antler orogeny but before the Sonoma orogeny. We have defined a new thrust belt superimposed on Antler foreland basin strata, and worked out a new, unconformity-based organization scheme for Mississippian, Pennsylvanian, and Permian rocks. This work has been funded by NSF, through grants awarded to me and my colleagues. Collaboration with a strong research group at Boise State University and the USGS has enabled me to broaden and generalize my investigations. Principle collaborators include Pat Cashman (UNR), Walt Snyder and Vladimir Davydov ( Boise State University), and Bruce Wardlaw (USGS).

• Tertiary basins in the northern Walker Lane, Western Great Basin . The Sierra Nevada - Basin and Range boundary is a zone of Neogene, distributed strike-slip deformation where large (mountain range scale) blocks have not only slipped past each other along major faults, but also have pushed up to form ranges and down to form basins. Stratigraphy of these basins records this tectonic activity. By combining detailed stratigraphy and sedimentology, structural studies, high-resolution isotopic dating, vertebrate biostratigraphy, tephrochronology, and gravity modeling, my colleagues and I are integrating the record in these poorly understood basins into a coherent Neogene tectonic history. In particular, Pat Cashman , Gary Oppliger, and John Louie (UNR); Jim Faulds , Chris Henry and Larry Garside (NBMG); Mike Perkins ( Univ. of Utah ), and Tom Kelly ( Los Angeles County Museum ) have been instrumental in this work.

Teaching:

Undergraduate courses

• Physical Geology
• History of the Earth
• Earth Surfaces Processes and Deposits
• Field Methods
• Field Camp

Graduate courses

• Basin Analysis
• Sedimentary petrology
• Sedimentary Structures

Publications in the Last Five Years:

Abstracts (* with students) :

• Cashman, P. H., Trexler, J. H., Jr., Henry, C. D., and Perkins, M. E., 1999, Deformation recorded in the Neogene Verdi basin, Sierra Nevada - Basin and Range transition, western Nevada (abst.): Geological Society of America Abstracts with Programs, v. 31, no. 7, p. A-116.
• *Muntean, T. W., Cashman, P. H., Trexler, J. H., Jr., and Henry, C. D., 1999, Tectonic evolution of the Gardnerville sedimentary basin, western Nevada (abst.): Geological Society of America Abstracts with Programs, v. 31, no. 6, p. A-81.
• Schiappa, T. A., Snyder, W. S., and Trexler, J. H., Jr., 1999, Tectonic signatures within the Pennsylvanian - Early Permian Tippipah Limestone, Nevada Test Site (abst.): Geological Society of America, Abstracts with Programs, v. 31, no. 4, p. A-54.
• Snyder, W. S., Schiappa, T. A., Davydov, V. I., Trexler, J. H., Jr., and Cashman, P. H., 1999, Strathearn basin: Late Pennsylvanian - Early Permian tectonostratigraphic setting of eastern Nevada (abst.): Geological Society of America, Abstracts with Programs, v. 31, no. 4, p. A-57.
• Trexler, J. H., Jr., Cashman, P. H., and Henry, C. D., 1999, A syntectonic Neogene basin in western Nevada (abs.): Geological Society of America Abstracts with Programs, v. 31.
• *Abbott, R. E., Cashman, P. H., Trexler, J. H., Jr., and Louie, J. N., 2000, Gravity survey constraints on the timing and style of extension of the Tertiary Gardnerville basin, western Nevada (abst.): Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-508.
• *McFarlane, M., and Trexler, J. H., Jr., 2000, Extension or contraction in earliest Antler tectonism?: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-383.
• *Muntean, T. W., Cashman, P. H., and Trexler, J. H., Jr., 2000, Tectonic evolution of the Neogene Sunrise Pass Formation, western Nevada (abst.): Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-44.
• Snyder, W. S., Trexler, J. H., Jr, Cashman, P. H., and Davydov, V. I., 2000, Tectonostratigraphic framework of the Upper Paleozoic continental margin of Nevada and southeastern California (abst.): Geological Society of Nevada Program with Abstracts, p. 76-77.
• Snyder, W. S., and Trexler, J. H., Jr, 2000, Collapsed borderland model for the Antler orogeny (abst.): Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-382.
• *TenBrink, A., Cashman, P. H., and Trexler, J. H., Jr, 2000, Neogene depositional and deformational history of Warm Springs Valley, northern Walker Lane (abst.): Geological Society of America Cordilleran Section Abstracts with Programs, v. 32, no. 6, p. A-71.
• *TenBrink, A. L., Cashman, P. H., and Trexler, J. H., Jr., 2000, Folded Neogene deposits in the northern Walker Lane, western Nevada (abs.): Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A167-168.
• Cashman, P. H., Trexler, J. H., Jr., Snyder, W. S., and Davydov, V. I., 2000, Geometry and kinematics of Late Pennsylvanian to Early Permian deformation at Carlin Canyon, central Nevada: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-316.
• Henry, C. D., Trexler, J. H., Jr., and Cashman, P. H., 2000, The Sierra Nevada - Basin And Range boundary near Reno , Nevada developed in two stages at ~12 and 3 Ma: Geological Society of America Abstracts with Programs, v. 32, no. 7, p. A-44.
• *Sweet, D., Snyder, W. S., Davydov, V. I., Trexler, J. H., Jr., and Groves, J. R., 2001, Upper Paleozoic Tectonic Unconformities in the Central Pequop Mountains, Nevada (abst.): GSA Abstracts with Programs, v. 33, no. 5, p. 47.
• Cashman, P. H., Trexler, J. H., Jr., Perkins, M. E., and Kelly, T. S., 2002, Post-3Ma deformation along the Sierra Nevada - Basin and Range transition zone near Reno , Nevada (abst.): Geological Society of America Abstracts with Programs, v. 34, no. 5, p. A-100.
• Trexler, J. H., Jr., Cashman, P. H., Kelly, T. S., and Perkins, M. E., 2002, Neogene sedimentary record of paleogeography along the eastern edge of the Sierra Nevada from 11 to 3Ma: Verdi basin, western Nevada (abst.): Geological Society of America Abstracts with Programs, v. 34, no. 5, p. A-44.
• *Snyder, W. S., Trexler, J. H., Jr., Davydov, V., I., Cashman, P., Schiappa, T. A., and Sweet, D., 2002, Upper Paleozoic Tectonostratigraphic Framework for the Western Margin of North America (extended abst.): AAPG Hedberg Research Conference-Late Paleozoic Tectonics and Hydrocarbon Systems of Western North America-The Greater Ancestral Rocky Mountains, p. 58-61.
• *TenBrink, A., Cashman, P. H., Trexler, J. H., Jr., Louie, J. N., and Smith, S., 2002, Active tectonism since 8Ma in the Sierra Nevada - Basin and Range transition zone, Lassen Co., CA (abst.): Geological Society of America Abstracts with Programs, v. 34, no. 5, p. A-100.
• Schiappa, T. A., Snyder, W. S., Trexler, J. H., Jr., Davydov, V. I., and Sweet, D., 2003, Depositional architecture of basins of the Upper Paleozoic Antler Foreland, Northen Pangaea: Examples from Nevada,USA (abst.): XVth International Congress on Carboniferous and Permian Stratigraphy, Utrecht Netherlands, Abstracts and Programs, p. 468-469.
• *McHugh, J. C., Cashman, P. H., Trexler, J. H., Jr., and Taylor, W. J., 2003, Late Paleozoic folding and thrust faulting in the northern Hot Creek Range, Nye County, Nevada (abst.): GSA Abstracts with Programs, v. 36, no. 6, p. 340.
• Snyder, W. S., Schiappa, T. A., Trexler, J. H., Jr., Cashman, P., Davydov, V. I., and Sweet, D., 2003, Permo-Carboniferous tectonostratigraphic framework for Western North America:  Implications for global correlation (abst.): XVth International Congress on Carboniferous and Permian Stratigraphy, Utrecht Netherlands, Abstracts and Programs, p. 510-512.
• *Cashman, P. H., Trexler, J. H., Jr., Muntean, T. W., Faulds, J. E., Louie, J. N., Oppliger, G., Abbott, R. E., and Clark, M., 2003, Neogene tectonic history of the Sierra Nevada - Basin and range transition zone at the latitude of Carson City, Nevada; geological and geophysical evidence (abst.): GSA Abstracts with Programs, v. 36, no. 6, p. 26.
• *Mass, K. B., Cashman, P. H., Trexler, J. H., Jr., Park, H., and Perkins, M. E., 2003, Deformation history in Neogene sediments of Honey Lake basin, northern Walker Lane, Lassen County, California (abst.): GSA Abstracts with Programs, v. 36, no. 6, p. 26.

References in Journals in the Last Five Years:

• Cashman, P. H., Cole, J. C., and Trexler, J. H., Jr., 2000, Superposed fold-thrust events at the Nevada Test Site, in Lageson, D. R., Peters, S. G., and Lahren, M. M., eds., Great Basin and Sierra Nevada: Boulder, Colorado, Geological Society of America Field Guide 2, p. 337-354.
• Trexler, J. H., Jr., 2000, Locating data on topographic maps - a field exercise in comparison of navigation methods: Journal of Geoscience Education, v. 48, no. 1, p. 33-38.
• Lindsay, E., Mou, Y., Downs, W., Pederson, J., Kelly, T. S., Henry, C., and Trexler, J., 2002, Recognition of the Hemphillian/Blancan boundary in Nevada: Journal of Vertebrate Paleontology, v. 22, no. 2, p. 429-442.
• Trexler, J. H., Jr., Cashman, P. H., Cole, J. C., Snyder, W. S., Tosdal, R. M., and Davydov, V. I., 2003, Widespread Effects of Mid-Mississippian Deformation in the Great Basin of western North America: Geological Society of America Bulletin, v. 115, no. 10, p. 1278-1288.
• Trexler, J. H., Jr., Cashman, P. H., Henry, C. D., Muntean, T. W., Schwartz, K., TenBrink, A., Faulds, J. E., Perlins, M., and Kelly, T. S., 2000, Neogene basins in western Nevada document tectonic history of the Sierra Nevada - Basin and Range transition zone for the last 12 Ma, in Lageson, D. R., Peters, S. G., and Lahren, M. M., eds., Great Basin and Sierra Nevada: Boulder, Colorado, Geological Society of America Field Guide 2, p. 97-116.
• Trexler, J. H., Jr., Cashman, P. H., Snyder, W. S., and Davydov, V. I., 2004, Upper Paleozoic tectonism in Nevada; timing, kinematics, and tectonic significance: Geological Society of America Bulletin, v. in press.
• Trexler, J. H., Jr., Cashman, P. H., Snyder, W. S., and Davydov, V. I., 2004, The western margin of North America after the Antler orogeny: Mississippian through Late Permian history in the Basin and Range, Nevada, in Woods, S., ed., GSA Cordilleran Section Fieldtrip Guidebook: Denver, USGS.