EARTHSC 1122 Study Guide - Final Guide: Lithographic Limestone, Kayenta Formation, Salt Dome
12 Apr 2016
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Triassic extinction cleared way for dinos, most likely volcanism and global warming. Triassic environment- at first bare, came off of extinction, stromatolites back, hot seas equal dead zones, ferns, first dinos and mammals. 3 main rock groups- lake/fluvial deposits, intruded by diorite, iron ore like grace mine. Hold-overs- prominent before triassic, barely made it to triassic. Triassic extinction- 50% almost wiped out bivalves, brachiopods, sponges, corals. Killed off conodonts, last of mammal like reptiles. Stoma- holes in plant leaves that take in co2, help see global warming. Diabase, diorite- igneous intrusions halfway between granite and gabbro, iron ore used in rev war. Grace mine- first seen by flying magnetometer, iron ore used in revolutionary war. Devil"s den- high ground created by diorite intrusions and fought on. Chinle formation- huge bone bed of 2 legged dinos, petrified log jam, painted desert, Shinarump formation- another big producer of uranium (#2) Moenkopi- watering holes with labyrinthodonts, early triassic.
