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- W41077713 abstract "Glacial and nonglacial deposits in the Wind River and Teton ranges of western Wyoming have been dated by radiocarbon, topographic position, surface morphology, weathering characteristics, lichenometry and soil stratigraphy. Of these many methods radiocarbon, lichenometry, weathering features, and soil stratigraphy are the most useful in differentiating deposits which formed mainly during periods of glaciation. No lichen growth-rate curve is available for the mountains of western Wyoming. However, numerous lichen transects across Neoglacial deposits yield relative data on lichen size and percent cover that correlate with the Front Range, Colorado, where growth rates for Rhizocarpon geographicum are known with precision. Surface weathering features that assist in deposit differentiation and correlation include: boulder frequency ratio of fresh to weathered stones, weathering rind thickness, and depth of pitting on stone surfaces.Soil profiles from well-drained sites in deposits containing granitic, gneissic, and granodioritic clasts are used to establish relative age. Soil morphology, particle size, organic constituents, selected soil-chemical parameters, primary mineral alteration and clay mineral composition are all used to establish a soil chronosequence. Soils in the sequence are, from youngest to oldest, post-Gannett Peak, post-Audubon, post-Indian Basin, post-Pinedale, post-Bull Lake, and pre-Bull Lake. In particular, changes in clay mineral composition with depth and changes in the ratio of oxalate-extractable to dithionite-extractable iron oxide are important age indicators. Petrographic analysis of fine and very fine sand separates (250–63 μm) reveals changes in the ratio of quartz to plagioclase feldspar, which assist in age differentiation." @default.
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- W41077713 date "1984-01-01" @default.
- W41077713 modified "2023-09-23" @default.
- W41077713 title "Evaluation of Dating Methods used to Assign Ages in the Wind River and Teton Ranges, Western Wyoming" @default.
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- W41077713 doi "https://doi.org/10.1016/s0920-5446(08)70081-5" @default.
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