Cryogeny ( dr. Greek κρύος - icy cold, frost and γένεσις - birth) - the second geochronological period of the Neoproterozoic era . It began 720 million years ago and ended about 635 million years ago. Thus, it lasted about 85 million years. The upper boundary of cryogenesis is based on stratigraphy , the lower is purely chronometric [1] .
This period was characterized by the most significant, up to the equator, glaciation of the Earth (the so-called “ Earth-snowball ” hypothesis [2] ).
During Cryogeny, the supercontinent Rodinia collapsed, the supercontinent Pannotia began to form.
Notes
- ↑ International Stratigraphic Scale (January 2015 version) on the website of the International Commission on Stratigraphy
- ↑ Oxygen-17 deficiency indicated the rate of thawing of the Earth-snowball (Link unavailable) Date of treatment March 3, 2013. Archived March 4, 2013.
Literature
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- Koronovsky N.V., Khain V.E., Yasamanov N.A. Historical Geology: Textbook. - M .: Academy, 2006.
- Ushakov S.A., Yasamanov N.A. Continental drift and Earth climates. - M .: Thought, 1984.
- Yasamanov N.A. Ancient climates of the Earth. - L .: Gidrometeoizdat, 1985.
- Yasamanov N.A. Popular paleogeography. - M .: Thought, 1985.
- Yeskov K.Yu. Amazing paleontology: the history of the Earth and life on it. - M .: ENAS, 2008 .-- S. 312.