Page 153 - Science Course 3 (Book 2)
P. 153
Mo11-L7a: Major Events During the Cenozoic Era
Early in the Tertiary period, India crashed into Asia, Glacial grooves are grooves made by rocks carried in
which began to push up the Himalayas. glaciers.
Africa began to push into Europe, forming the Alps.
Europe
Africa
Cenozoic Life – The Age of Mammals
Many new types of mammals appeared during the
Cenozoic era.
The Cenozoic era is sometimes known as the age of
mammals.
In North America, the western coast continued to
push against the seaf oor next to it, and the Rocky The large mammals of the Cenozoic era are called
Mountains continued to grow. mega-mammals.
New mountain ranges—the Cascades and the Sierra
Nevadas—began to form along the western coast.
The Pleistocene epoch was the f rst epoch of the
Quaternary period.
During this time, glaciers advanced and retreated
many times.
Mega-mammals are all extinct today, but many fos-
sils have been discovered The human is included for
reference.
Some scientists hypothesize that marsupial ances-
An ice age is a time when a tors migrated to Australia from South America when
large proportion of the continents were connected to Antarctica by land
Earth’s surface is bridges.
covered by
glaciers. Over time, the ancestral marsupials evolved into the
types of marsupials that live in Australia today.
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