Geoarchaeology and Holocene landscape history of the Carson Desert, western Nevada1
David Rhode, Kenneth D. Adams, Robert G. Elston, 2000. "Geoarchaeology and Holocene landscape history of the Carson Desert, western Nevada", Great Basin and Sierra Nevada, David R. Lageson, Stephen G. Peters, Mary M. Lahren
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Human populations arrived in the Carson Desert of the western Great Basin by ~11 ka a time period shortly after the desiccation of Lake Lahontan. Since that time, significant lake-level fluctuations have occurred but the precise timing, duration, and elevation attained by each of these post-highstand lakes is a matter of some debate. Until a well dated, detailed chronology of post-highstand lake levels is constructed, much of the archaeological record in this area will remain without a strong paleoenvironmental framework. This field trip will present preliminary results from current efforts to define the paleoenvironmental framework and its relationship to the archaeological record.
For this trip we have chosen four stops that exemplify latest Pleistocene to late Holocene conditions and highlight this multidisciplinary effort to place the archaeological record into a paleoenvironmental context. The late Pleistocene/early Holocene Sadmat site is located on and near a series of beach ridges ranging in elevation from ~1220–1235 m. These beach ridges may date from the Younger Dryas period (10.9–10.0 ka), suggesting that the site was occupied when large lakes were present in the Carson Sink. A synthesis of existing and new data is next presented for Hidden Cave, which possesses a stratified paleoenvironmental record of at least the last 20,000 yrs, and a record of human occupation dating as early as 9 ka, but used most intensively during the Neoglacial, ca. 3.8–3.6 ka. The Salt Wells beach barrier and surrounding features provides evidence that a substantial lake was present in the Carson Sink <2 ka, a lake that would submerge the late Holocene archaeological sites in the Stillwater Marsh beneath at least 20 m of water. The fortuitous exposure of a large number of late-Holocene archaeological sites in the Stillwater Marsh in the 1980s has greatly increased our knowledge of how native people lived in and used the Marsh. Placing these and other archaeological sites in the Carson Desert into a dynamic paleoenvi-ronmental context provides new insights into the environmental challenges facing foraging societies in the region, and how the changing distribution of natural resources affected their activities.
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Great Basin and Sierra Nevada, the second volume of the Geological Society of America Field Guide Series, focuses on the dynamic and spectacular geology of this region, providing the inspiring backdrop for the 2000 GSA Annual Meeting in Reno. This volume gives complete coverage of field trips held in conjunction with that meeting, and contains 20 chapters organized into three sections. The first section consists of 16 chapters arranged in geochronological order, beginning with the active tectonics of Lake Tahoe and the historical surface faulting and paleoseismicity of the central Nevada seismic belt, and ending with the Neoproterozoic glacial record of Death Valley. In between are chapters dealing with Basin and Range extension, Eocene magmatism, Mesozoic plutonism in the Sierra Nevada, Paleozoic subduction, and Ordovician stratigraphy, to name a few. The second section covers the geology of the Nevada Test Site and the nuclear-waste repository at Yucca Mountain. The last section is an invited field guide from the 1999 GSA Cordilleran Section meeting that covers the wines and geology of Napa Valley, California. Overall, Great Basin and Sierra Nevada is a comprehensive compilation of new and exciting research on this amazingly diverse region, with well-crafted guides to field localities of special interest. Full-color plates in some chapters make this guide an especially appealing and useful volume.