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Paleozoic - Late - Late Paleozoic Tectonics Late Paleozoic...

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1 Late Paleozoic Tectonics Late Paleozoic 410-250 million years ago. Divided into Devonian, Carboniferous, Permian. By the Permian Pangea was assembled. During this time… – Acadian & Caladonian orogenies – Alleghenian & Hercynian orogenies Late Paleozoic Paleozoic climate • Blue-tillite • Red-coal • Green- evaporites Paleozoic glacial striations Devonian
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2 Late Paleozoic Land areas were small with low relief until this time. Calcareous organisms abounded. Warping of the crust in N.A. was widespread in the early Devonian. During this time an immense barrier reef extended northwest into Canada. These reefs now yield petroleum reserves in the Canadian Rockies. Devonian was a time of severe cratonic deformation due to effects of mountain building in eastern N.A. – ACADIAN MOUNTAINS. Kaskaskia Sea First major transgression of late Paleozoic. Did not regress until Mississippian. This produced the Oriskany sandstone. Kaskaskia -the next cratonic sequence You may have seen it! Oriskany sandstone. Very resistant. Very mature. Hawk Mountain, PA Catskill “mountains” The Catskill clastic wedge is named for the Catskill Mountains in southeastern NY. Catskill sediments coarsen towards the east and reflect elevation and erosion of Acadian orogeny -Devonian in age. Catskills were actually a delta eroding off the Acadian mountains!
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3 Catskills More Catskill info Tropical world.
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