HistGeolChapt10 - Chapter 10 Early Paleozoic Earth...

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Chapter 10 - Early Paleozoic Earth History (Cambrian – Silurian Periods) (Modified from Hatcher et al. (1990), Steltenpohl et al. (1995), and Hooper & Hatcher (1988).)
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The Paleozoic history of most continents involves major mountain-building activity along their margins (mobile belts) & numerous shallow- water marine transgressions and regressions over their interiors. These transgressions and regressions were caused by global changes in sea level, most likely related to plate activity and glaciation. Most of the geologic time scale was developed in Europe, sedimentary record in North America was a little different, so we will be looking at the major Transgressive-Regressive sequences of the Paleozoic Era and how they affected life. 2
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With the Late Proterozoic breakup of Rodinia and Pannotia – 6 continents existed in early Paleozoic. Each continent composed of craton and one or more mobile belts . Craton composed of shield and platform upon which the Paleozoic sediments were deposited. Cratons were built by tectonic activity during the Precambrian, but remained stable during the Paleozoic. The transgressing and regressing shallow seas (epeiric seas) were a common feature of most Paleozoic cratonic histories. Flooding occurred during times of higher activity at rift zones , shrinkage of global ice sheets , and/or continental “sinkage” following rifting . 3
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not covered during Paleozoic, re- mainder of craton (light brown) was periodically cover- ed by epeiric (shallow, inland) seas . Green (basins) & yellow (domes) = local areas of gentle warpage of platform sedimentary rocks. Appalachian Basin
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This note was uploaded on 03/27/2012 for the course GEOL 2413 taught by Professor Moody during the Spring '10 term at Texas A&M University, Corpus Christi.

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HistGeolChapt10 - Chapter 10 Early Paleozoic Earth...

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