Paleogeography
• Tectonic events
– Rifting between Africa-S. America;
• India-Antarctica/Australia;
• Britain-New Foundland;
• Madagascar-Africa
– Collisions Sevier and Laramide orogeny
in western US
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Paleogeography of the Western US: Tectonic Events, Orogenies, and Sea-Level Changes, Slides of Earth Sciences
An overview of the paleogeography of the western us, focusing on tectonic events, orogenies, and sea-level changes. Topics include rifting between africa and south america, india-antarctica/australia, britain-new foundland, and madagascar-africa. The document also covers the cordilleran orogenic system, with its terrane accretion, subduction, intense deformation, fold-thrust belts, plutonism & volcanism, and sevier and laramide orogenies. Additionally, it discusses the highest stand of sea-level in the atlantic coastal plain, subsiding florida, and the deposition of black shales during the cretaceous period.
Typology: Slides
2012/2013
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Paleogeography
• Tectonic events
– Rifting between Africa-S. America;
- India-Antarctica/Australia;• Britain-New Foundland;• Madagascar-Africa
– Collisions Sevier and Laramide orogeny
in western US
Cordilleran Orogenic System• Terrane accretion• Subduction• Intense deformation• Fold-thrust belts• Plutonism & Volcanism• Sevier Orogeny
- 130-80 my
- Laramide Orogeny
- 80-50 my
- Laramide Orogeny
Sevier type deformation consisting of thrust faults
Highest stand of sea-level280m above currentAtlantic coastal plainsubsidingFlorida was a shallowsubmarine carbonate bankBlack shales: carbonaceousmatter from unoxidizedphytoplankton due to lackof polar cold watercirculation
Area of outcrop of Cretaceous limestone and marl in the Atlanticand Gulf Coast Coastal Plain Fall Line