GEOL 1020 Study Guide - Midterm Guide: Cuddie Springs, Wild Horse, Continental Shelf
7 Sep 2016
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Defining characteristics of the pliocene 5. 3 to 1. 8 mya. Woodland muskox: continuation of ice age mammals, appearance of early bipedal human ancestors in eastern africa (hominids) Flora: cool weather plants evolve at high latitudes, grasslands, taiga evergreen forests, tundra with mosses/lichens. Global climate: cool/dry warm/wet cool/dry . Great american interchange: 3. 5-3mya, isthmus of panama forms. Allows connection for land mammals bw north and south. Na sa: camels, pigs, deer, elephants . Cuts off ocean exchange between pacific and atlantic: extinction of sa marsupials, extinction of marine invertebrates. Also : expansion of grasslands, beginning of separation bw atlantic/pacific marine organisms. Defining characteristics of the pleistocene 1. 8mya 11,500 ya. Drops in sea level land bridges. Widespread continental glaciation evidence on north american plate. Moraines = landforms composed of glacial tills (mixture of sediment transported by the glacier and deposited by the sides of the glacier) Ground moraine: thin till layer deposited during ice retreat.
