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Permian Period
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Permian paleogeography geologic time continental ice sheet Eryops Dimetrodon Permian Period in geologic time marine evaporite deposition Pensacola Mountains Dimetrodon Edaphosaurus
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Permian Period summary
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Permian paleogeography
Permian paleogeography Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins near the end of the Permian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

Permian Period

geochronology
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Written by
Charles A. Ross
Senior Biostratigrapher, Chevron U.S.A., Inc., Houston, Texas. Editor of Timing and Depositional History of Eustatic Sequences.
Charles A. Ross,
June R.P. Ross
Professor of Biology, Western Washington University, Bellingham. Editor of Bryozoa.
June R.P. Ross•All
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Waldemar Christofer Brøgger

Permian Period, in geologic time, the last period of the Paleozoic Era. The Permian Period began 298.9 million years ago and ended 252.2 million years ago, extending from the close of the Carboniferous Period to the outset of the Triassic Period. At the beginning of the period, glaciation was widespread, and latitudinal climatic belts were strongly developed. Climate warmed throughout the Permian times, and, by the end of the period, hot and dry conditions were so extensive that they caused a crisis in Permian marine and terrestrial life. This dramatic climatic shift may have been partially triggered by the assembly ...(100 of 5525 words)

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