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Asselian Stage
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A geologic time scale chart showing the Permian period of the Paleozoic era, divided into Cisuralian, Guadalupian, and Lopingian epochs with their corresponding ages and millions of years ago. A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years.
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A geologic time scale chart showing the Permian period of the Paleozoic era, divided into Cisuralian, Guadalupian, and Lopingian epochs with their corresponding ages and millions of years ago.
Permian Period in geologic time The Permian Period and its subdivisions.

Asselian Stage

stratigraphy
Written by
June R.P. Ross
Professor of Biology, Western Washington University, Bellingham. Editor of Bryozoa.
June R.P. RossAll
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Asselian Stage, first of the four stages of the Lower Permian (Cisuralian) Series, encompassing all rocks deposited during the Asselian Age (298.9 million to 295.5 million years ago) of the Permian Period. The Asselian Stage is especially well-developed in the Perm region of Russia. Asselian deposits are shales and limestones interbedded with thin layers of sandstones and conglomerates. They were deposited on the eastern edge of the Russian Platform and the upper slope of the...

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