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Earth History GEOL 2110. The Paleozoic Era Carboniferous and the Permian Periods in North America. Major Concepts. Carbonate deposition dominant in the Silurian and Devonian, persisted into the early Carboniferous (the Mississippian period).

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earth history geol 2110

Earth History GEOL 2110

The Paleozoic Era

Carboniferous and the Permian Periods

in North America

major concepts
Major Concepts
  • Carbonate deposition dominant in the Silurian and Devonian, persisted into the early Carboniferous (the Mississippian period).
  • After a major regression and subsequent transgression marking the Mississippian-Pennsylvanian break in North America, the Absaroka sequence was dominated by clastic sediments and great accumulations of land-based organic material creating coal seams.
  • This change in sedimentation, which persisted into the Permian, was triggered by creation of the final orogenic event of the Appalachian mobile belt caused by the collision of southeastern North America with Africa and South America and the creation of the large continental land mass ever on Earth - Pangea
mississippian deposits more limestone
Mississippian DepositsMore Limestone

Chockful

O’ Crinoids

Madison LS, MT

Redwall LS, AZ

Pahasapa LS, SD

late mississippian regression
Late Mississippian Regression

Immature clastic sediment appear in Eastern NA deposits

Sourced from deeper erosion of rejuvenated Caledonian and Acadian Mts

More Unconformities developed on warped craton highs

pennsylvanian deposits cyclothems trangressive cycles
Pennsylvanian DepositsCyclothems – Trangressive Cycles

Limestone

Coal

Organic Shale

TRANSGRESSION

Shale

Sandstone

Illinois Basin Cyclothem

pennsylvanian deposits over 100 cycles in 100 million years
Pennsylvanian DepositsOver 100 Cycles in 100 million years!
  • Cause of Cycles
  • Rapid sea level changes due to Gondwanaland glaciation
  • Spasmodic tectonic up-down oscillations
  • Cyclic climate change affecting erosion and sedimentation
pennsylvanian coal deposits subtropical rain forests
Pennsylvanian Coal DepositsSubtropical Rain Forests

Peat

Anthracite

Everglades

Bituminous Coal

AnthraciteCoal

continent continent collision monster thrust faulting
Continent-Continent CollisionMonster Thrust Faulting

1950’s Interpretation

1980

~260 Km Displacement

summary of paleozoic tectonics
Summary of Paleozoic Tectonics

Acadian/Caledonian

Appalachian/Hercynian

Gondwanaland

Taconian

North American Paleozoic Orogenies

next lecture
Next Lecture
  • The Paleozoic Era
  • Geological History of Gondwanaland and Late Paleozoic Life
  • Mid-term on Friday!!
  • Chapters 8-13