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As a result, the ESRP slopes to the southwest, away from the present location of the plume beneath the Yellowstone Plateau.The ESRP is divided into north and south segments by a cluster of large shield volcanoes, lava flows and rhyolitic domes.This topographic feature is called the axial volcanic high.Drainage in the northern Big Lost River-Mud Lake segment is internal, i.e. Rivers that flow into this area sink into highly porous basalt lavas or form lakes.3); the edifices to west are shield volcanoes; 2) late Pleistocene lava flow covered with 4 m of loess of entirely Pinedale age (~25-16 ka); 3) young lava flow (6 ka) with almost no loess cover; 4) fill-cut terraces along the Snake River with The Eastern Snake River Plain (ESRP) is a northeast-trending, 300 kilometer-long depression underlain by Cenozoic volcanic rocks (Fig. Well-known for many examples of volcanic landforms including basalt lava flows, cinder and tuff cones, fissure vents, and shield volcanoes, the ESRP also contains substantial eolian deposits of loess (wind-deposited sandy silt) and sand dunes.
Details20 m of loess ranging from at least 75 ka to 16 ka (Fig.North of the axial volcanic high, alluvial fans and outwash from drainages with alpine glaciers were likely the most important loess sources.During Pleistocene glaciations, the Snake River probably operated like modern high latitude rivers with high discharge and flooding during spring-early summer meltout, and low discharge during winters when the glacial outwash system was largely frozen.This produces dominantly northeast-directed winds in the ESRP.Pleistocene Glaciations and Eolian Deposits Pleistocene glacial climates greatly influenced the development of ESRP eolian features.