A loess–paleosol record of climate and glacial history over the past two glacial–interglacial cycles (~ 150 ka), southern Jackson Hole, Wyoming
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Abstract
Loess accumulated on a Bull Lake outwash terrace of Marine Oxygen Isotope Stage 6 (MIS 6) age in southern Jackson Hole, Wyoming. The 9 m section displays eight intervals of loess deposition (Loess 1 to Loess 8, oldest), each followed by soil development. Our age-depth model is constrained by thermoluminescence, meteoric 10Be accumulation in soils, and cosmogenic 10Be surface exposure ages. We use particle size, geochemical, mineral-magnetic, and clay mineralogical data to interpret loess sources and pedogenesis. Deposition of MIS 6 loess was followed by a tripartite soil/thin loess complex (Soils 8, 7, and 6) apparently reflecting the large climatic oscillations of MIS 5. Soil 8 (MIS 5e) shows the strongest development. Loess 5 accumulated during a glacial interval (~ 76–69 ka; MIS 4) followed by soil development under conditions wetter and probably colder than present. Deposition of thick Loess 3 (~ 43–51 ka, MIS 3) was followed by soil development comparable with that observed in Soil 1. Loess 1 (MIS 2) accumulated during the Pinedale glaciation and was followed by development of Soil 1 under a semiarid climate. This record of alternating loess deposition and soil development is compatible with the history of Yellowstone vegetation and the glacial flour record from the Sierra Nevada.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A loess–paleosol record of climate and glacial history over the past two glacial–interglacial cycles (~ 150 ka), southern Jackson Hole, Wyoming |
| Series title | Quaternary Research |
| DOI | 10.1016/j.yqres.2011.03.006 |
| Volume | 76 |
| Issue | 1 |
| Year Published | 2011 |
| Language | English |
| Publisher | Cambridge University Press |
| Contributing office(s) | Crustal Geophysics and Geochemistry Science Center, Eastern Geology and Paleoclimate Science Center, Geosciences and Environmental Change Science Center, Northern Rocky Mountain Science Center |
| Description | 23 p. |
| First page | 119 |
| Last page | 141 |
| Country | United States |
| State | Wyoming |
| City | Jackson |
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