11lpaleohist - 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… 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 Tilting Oriskany
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3 Catskill “mountains” • The Catskill clastic wedge is named for the Catskill Mountains in southeastern NY. • Catskill sediments coarsen towards the east and reFect elevation and erosion of Acadian orogeny -Devonian in age. • Catskills were actually a delta eroding off the Acadian mountains! Catskills
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11lpaleohist - Late Paleozoic Tectonics Late Paleozoic...

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