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06-Jul-2019 02:38

The river was transformed from a narrow, largely single-channel meandering stream into a huge braided stream with a floodplain 10 to 30 kilometers wide.Deposits of the braided stream are dominated by gravels but considerable sand and silt are also present. Older deposits are probably present in the subsurface.A buried soil horizon (paleosol) is present near the base of the trench indicating that several periods of loess deposition have occurred.Optically stimulated luminescence (OSL) dating is used to measure elapsed time since last exposure of the loess to sunlight.

Beginning about 16 million years ago (Ma) and continuing to the present, the plate has moved progressively over the plume, causing uplift and rhyolitic caldera eruptions followed by subsidence and basaltic volcanism.South of the axial volcanic high, the Snake River flows down the slope of the plain.The topography of the ESRP is favorably oriented to funnel the strong westerly winds typical of mid-latitude North America.Loess Loess is widespread across the ESRP, reflecting multiple sources of fine-grained sediment.South of the axial volcanic high, the major source was outwash deposits along the Snake River.

Beginning about 16 million years ago (Ma) and continuing to the present, the plate has moved progressively over the plume, causing uplift and rhyolitic caldera eruptions followed by subsidence and basaltic volcanism.South of the axial volcanic high, the Snake River flows down the slope of the plain.The topography of the ESRP is favorably oriented to funnel the strong westerly winds typical of mid-latitude North America.Loess Loess is widespread across the ESRP, reflecting multiple sources of fine-grained sediment.South of the axial volcanic high, the major source was outwash deposits along the Snake River.During the Pleistocene, a large ice sheet formed several times on the Yellowstone Plateau (Fig. Two periods of glaciation have been recognized and dated at Yellowstone: the Pinedale glaciation between 14,000-25,000 years ago (14-25 ka); and the Bull Lake glaciation between about 140-150 ka.