112-pp25 - UNIVERSITY OF SOUTH ALABAMA Last time it was a...

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1 GY 112: Earth History Paleozoic 2: Laurentian Orogenies UNIVERSITY OF SOUTH ALABAMA Last time it was a test. ... ....before that we covered… The Paleozoic Part 1 1) Laurentian passive continental margin sedimentation 2) Central North America 3) The Grand Canyon (geology) Laurentia (Paleozoic North America) Consider: 1) passive continental margin 2) shallow marine water (shelf) 3) tropical climate All the way from Labrador to Alabama 1+2+3= Fossil. Limestone, oolite, quartz arenite etc. Equator: Cratonic Sequences When continents flood during transgressions, sediment is deposited. When regressions occur, erosion takes place producing unconformities (disconformities) Thick sedimentary packages between disconformities are called cratonic (depositional) sequences . Cratonic Sequences When continents flood during transgressions, sediment is deposited. When regressions occur, erosion takes place producing unconformities (disconformities) Thick sedimentary packages between disconformities are called cratonic (depositional sequences). •Basins have thick sequences (shorter disconformities) •Arches/domes have thin sequences (longer disconformities) Cratonic Sequences And every depositional sequence is named (e.g., Sauk, Tippecanoe, Kaskaskia etc.) Why the variation in thickness from the center of the craton to the edge?
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2 Cratonic Sequences Laurentia
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112-pp25 - UNIVERSITY OF SOUTH ALABAMA Last time it was a...

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