Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Biological events in geological records

Document Type : Original Research Paper

Author
Ashtyan Islamic Azad University, Ashtyan, Iran
Abstract
There are biological events in geological record, that within a short period of time have Caused profound effects on earth. These events embrace the sudden appearance, explosive evolution, spreading of new species and mass extinction. It seems that the causes of these phenomena have their roots in the inner activities of the earth, and or the explosions of the supernova.
This paper attempt to describe different biological events, especially mass extinctions and their causes.
Subjects

 
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