The Ectasian period ( ancient Greek ἔκτασις - “expansion”) is the second geological period of the Mesoproterozoic era , which lasted 1,400–1,200 million years ago (chronometric dating, not based on stratigraphy ) [1] .
The name of the period was due to continued sedimentation and expansion of sedimentary covers .
In the 1200 million-year-old rocks from the Canadian island of Somerset , fossil red algae were found - the oldest known multicellular [2] .
Notes
- ↑ International Chronostratigraphic Chart (English) . International Commission on Stratigraphy (April 2016). Archived April 26, 2015.
- ↑ Bangiomorpha pubescens n. gen., n. sp .: implications for the evolution of sex, multicellularity, and the Mesoproterozoic / Neoproterozoic radiation of eukaryotes - Butterfield 2 ...
Literature
- Jordan N. BC The development of life on earth. - M .: Enlightenment, 1981.
- Koronovskiy 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.
- N.A. Yasamanov Ancient climates of the Earth. - L .: Gidrometeoizdat, 1985.
- N.A. Yasamanov Popular paleogeography. - M .: Thought, 1985.
Links
- Ectasian Period Unrefered (inaccessible link) . GeoWhen Database . The date of circulation is October 16, 2012. Archived January 6, 2013.