GEOL 102 Historical Geology

Spring Semester 2011
The Late Paleozoic Era II: Permian Geology

Paleogeography and Geology of the Permian:
Increase in continental climates (extreme summers and winters, arid conditions) in many parts of the world, as Pangaea becomes more emergent.

In restricted basins, major evaporite deposits. Elsewhere, lots of eolian deposits.

CO2 levels begin to rise:

Collision between Siberia and northeastern Pangaea (former eastern part of Euramerica/Laurussia); Uralian Orogeny (Permian)

The Chinese blocks remain the only large cratons not attached to Pangaea.

Latest Permian and earliest Triassic:

Downwarped basins in what is now west Texas were bordered by big reef complexes (sponges, bryozoans, algae, brachiopds are main reef formers); otherwise, very few reefs from the Permian.

At very end (last half million years?) of Permian: Siberian Traps:

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Last modified: 14 January 2011