TERPTTAPVR Atn A.


245
In the seas the invertebrate life had, in all its great branches,
mnade progress toward modern forms, but these changes do not
demand notice in detail.
FIa. 91.


HiEAD OF A MIOCENE MAMMAL. Sivatherium giganteum, greatly reduced.
FIG. 92.


NUMMULINA LmnVIGATA.
DISTURBnACES.
Jlountain .Afaling. The quiet progress of the era was interrupted
by orographical disturbances. At the close of the Eocene period
there was a moderate elevation along the Atlantic. At the close of
the Miocene, the Coast range was formed, and the western area, gen-
erally, involved in the movement. At the close of the Pliocene, or
in other words, at the close of the age, there was a general conti-
nental elevation which lifted the whole to a height several hun-
lred feet above its present altitude. This appears to have been
most felt at the north, where there are evidences of elevation to a
height of 1,000 feet to 2,000 feet above the present continental
position.




















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