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Additional
Paleogene
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Paleogene
The
Paleogene
( or ;
also spelled
Palaeogene
or
Palæogene
; informally
Lower Tertiary
) is a
geologic period and system
that began ended and comprises the first part of the
Cenozoic
Era
. Lasting 43 million years, the Paleogene is most notable as being the time in which
mammals evolved
from relatively small, simple forms into a large group of diverse
animals
in the wake of the
Cretaceous–Paleogene extinction event
that ended the preceding
Cretaceous
Period.
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