number and importance. Deciduous trees make their appearance.
Animal life largely reptilian. The class Mammalia represented by
marsupials.

Cenozoic Time.
Tertiary, or Age of Mammals: Eocene, Miocene, Pliocene.
Quarternary, or Age of Man: Glacial or Pleistocene, Recent.


At the close of the Mesozoic time, great elevations of land took
place in both America and Europe, especially in the northern
portions.<21> This could not fail to have a great effect on
life, both animal and vegetable.

During the Eocene, or first division of the Tertiary Age, we
have simply to note the steady progress of life. There were
forests of species of oaks, poplars, maples, hickories, and
other common trees, and others now found only in tropical
regions. Palm trees were growing in the upper Missouri region of
the United States. And England was decidedly a land of Palms, as
no less than thirteen species are known to have been growing
there. Cypresses, yews, and pines graced the scene.<22>
Our special interest centers, however, in the mammals of
this epoch.

Illustration of The Paleotherium.--------


In the preceding epoch marsupials only were represented. But in
beds of the middle and closing portions of the Eocene period we