112-pp35 - 1 Quiz 10 10:10-10:15AM GY 112: Earth History...

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Unformatted text preview: 1 Quiz 10 10:10-10:15AM GY 112: Earth History Cenozoic Geology Part 1 UNIVERSITY OF SOUTH ALABAMA Last Time Cenozoic Overview A) Cenozoic time frame B) Climatic change (Mesozoic-Cenozoic) C) Key Evolutionary Events Introducing the Epochs (the smallest common divisions of geological time) Cenozoic Time Frame Cenozoic Paleocene (65-58 MA) Eocene (58- 37 MA) Oligocene (37 - 24 MA) Miocene (24-5.0 MA) Pliocene (5.0 1.6 MA) Tertiary (65-1.6 MA) Pleistocene (1,600,000 10,000 years) Holocene (10,000 0 years) Quaternary (1.6 - 0 MA) Epoch Period Mesozoic Climate Oceans stagnated Epicontinental black muds when seas spilled over Normally thin oxygen poor zone expanded This will change in the early Cenozoic (Late Eocene) Cenozoic Climate Oxygen isotopes Late Eocene cooling Deep sea foraminifera 2 Mammals diversified Most modern orders present by Early Eocene Cenozoic Life Terrestrial Life Grasses Herbs and weeds Requires arid climate Cooler climate linked to Antarctic glaciation Cenozoic Life Todays Agenda A) Cenozoic Ocean currents B) Cenozoic Tectonic Events C) Messinian Salinity Crisis Web notes 35 Cenozoic Currents Paleocene-Middle Eocene: No circumpolar current Late Eocene-today: Circumpolar current Permitted development of glaciers on Antarctica Cenozoic Currents Cenozoic Deep Ocean Currents White Board 3 Cenozoic Tectonic Events Cenozoic Tectonic Events Final breakup of Gondwanna (Australia separated from Antarctica in the Latest Paleocene earliest Eocene epochs) India began to collide with Asia forming the Himalayan Mountain Range (Oligocene to Recent) Africa started to shift northward, gradually sliding under Europe and uplifting the Alps (Oligocene to Recent) Continued westward movement of North America and South America formed an on again off again land bridge between the two continents. This gave rise to some interesting animal exchanges (see evolutionary events below). North American orogenies become dominated by strike-slip faulting and uplift. Mountain building in the northern part of the Cordilleran mountains (mostly Canada) slow down stop during the Oligocene. Activity shifts to the southern part of the mountain chain (Colorado, Nevada etc.). Major late Tertiary flood basalt eruptions occur in Oregon and Washington state. Hot spot volcanism occurs in the area of Yellowstone (Pliocene to present). Composite volcanic eruptions (some incredibly explosive) periodically occurred and still do (e.g., Mt St Helens)....
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112-pp35 - 1 Quiz 10 10:10-10:15AM GY 112: Earth History...

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