112-pp24 - 1 GY 112: Earth History Paleozoic 1: Laurentia...

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Unformatted text preview: 1 GY 112: Earth History Paleozoic 1: Laurentia UNIVERSITY OF SOUTH ALABAMA Last time we covered (before the break) The Cambrian Explosion A) Phanerozoic time frame B) Why a Cambrian explosion C) Introducing our ancestors Paleozoic Time Frame (detail) Early Middle 550-505 Ma Late Cambrian Early Middle 504-441 Ma Late Ordovician Early Middle 441-418 Ma Late Silurian Early Middle 418-362 Ma Late Devonian Early 362-320 MA Late Mississippian Early 320-286 Ma Late Pennsylvanian Carb Early 286-245 Ma Late Permian Paleozoic The Cambrian Explosion ht p:/ arjournals.annualreviews.org/na101/home/literatum/publisher/ What we know about the early development of all of the current phyla is limited to sites where we have lots of beasties preserved Burgess Shale Fauna Chengjiang Fauna ht p:/ home.earthlink.net/~airdpacoima/sitebuildercontent/sitebuilderpictures/burgess__s.jpg The Burgess Shale Todays Agenda The Paleozoic Part 1 1) Laurentian passive continental margin sedimentation 2) Central North America 3) The Grand Canyon (geology) The next few lectures includes several detailed diagrams that require a bit more discussion than usual. We might not get through everything as planned each day. (Web notes 24) 2 Laurentia (Paleozoic North America) Laurentia (Paleozoic North America) In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated. Laurentia (Paleozoic North America) In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated. Convergent boundary well to the north. Laurentia (Paleozoic North America) In the early Paleozoic (Cambrian to Middle Ordovician) North America was pretty isolated....
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112-pp24 - 1 GY 112: Earth History Paleozoic 1: Laurentia...

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