THE CENOZOIC: PALEOGENE WORLD
geologists have divided the Cenozoic
into two Periods: Tertiary (65my-1.8my) and the Quaternary (1.8-present). The Tertiary was
further divided into the Epochs: Paleocene, Eocene, Oligocene, Miocene and Pliocene
and the Quaternary includes the Pleistocene
More recently the
Paleogene world includes Paleocene,
Eocene and Oligocene.
The later Miocene,
Pliocene, Pleistocene and Holocene Epochs were then lump
together to form the Neogene.
freshwater animals after the
dinosaur extinction were represented by rapid radiation of mammals. The
first carnivorous mammals appeared by the mid-Paleogene by the end of
change and mass extinction.
During the Paleocene climate was warming, with very warm sea temperature
even in arctic areas at the boundary between Paleocene and Eocene. The
warmness of the polar water disturbed vertical circulation of water and
caused the mass extinction due to anoxic environment. The Green River
Formation of Wyoming/Utah is an important feature of this time period
Western North America
experienced continued to experience the Laramide
Orogeny, which began during the
late Cretaceous (100mya) and continued through the Paleogene.
This mountain building event is responsible for the formation of
the North American Rocky Mountains The
Laramide Orogeny is characterized by low angle of the subduction that
developed during the Sevier stage. Today in the Rockies we can observe
the results because of erosion and isostatic uplift. Complicated
collision of the three plates caused clock-wise rotation of the Colorado
plateau. Yellowstone National Park Volcanism began during Eocene
featured active volcanism with petrifying forest in lava.
The Gulf coast in Eocene featured Mississippi Embayment that develop in failed rift and Mississippi river delta started during Oligocene as the sea withdrew.
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