feb 8, 66111111 BC - Reign of mammals begins
Description:
All sauropsids except for a few birds die out. These birds radiate extensively throughout the follow era, however.
Small mammals are able to emerge, recolonize, and thrive throughout the cenozoic, displaying a trend towards larger sizes over time.
Added to timeline:
Chordate Evolution over Geologic Time
Phanerozoic geologic time scale showcasing evolutionary deve...
Date:
