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Unformatted text preview: 1 GY 301: Geomorphology GY 301: Geomorphology Lecture 25: Aeolian Processes & Sandy Deserts UNIVERSITY OF SOUTH ALABAMA Last Time A) Cenozoic temperature shifts (GY 112) B) Causes of Plio-Pleistocene Glaciations C) Consequences of Plio-Pleistocene Glaciations Plio-Pleistocene Major world-wide cooling first began in the early Eocene. Glacial/Interglacial Stages > 500 KA Nebraskan glacial 435 500 KA Aftonian interglacial 300 435 KA Kansan glacial 265 300 KA Yarmouth interglacial 125 265 KA Illinoisan glacial 75 125 KA Sangamon interglacial 10 75 KA Wisconsinian glacial 0 - 10 KA Holocene interglacial Time frame Name of stage Glacial/ interglacial stage Milankovitch Cycles Three major changes in Earths orbit are linked to glacial oscillations Eccentricity Obliquity Precession Great lakes Last glacial maximum 35,000-10,000 years ago Wisconsin Stage Remained when ice sheets melted back Consequences of Continental Glaciations 2 The Great Flood (catastrophic emptying of Lake Missoula) Consequences of Continental Glaciations ht p:/ hugefloods.com/Lake_Missoula_Map.gif The Scablands : the area affected by the flooding Consequences of Continental Glaciations ht p:/ www.nps.gov/iceagefloods/J-ext1.JPG Lowering of sea level Exposed continental shelves Consequences of Continental Glaciations Climate impacts were felt globally Steepened temperature gradients Increased aridity Exception: Great Basin Lakes Great Salt Lake Consequences of...
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- Fall '10