A period of time that
existed from 23 to 5.3 MYA.
The climate of the
Miocene was warmer than the Oligocene before it, or the Pliocene
after it. The warmer temperatures allowed for two important
ecosystems to emerge: Grasslands
and Kelp forests.
After the warming period,
the earth began to cool.
Deserts and Tundras began
to expand, while Forests began to disappear.
Many of the fossil
species of this time have close relatives alive today.
Mammals and birds
developed to look like they do today.
95% of plant species
today existed during the Miocene.
In North America the
Sierra Nevada and
Cascade Mountains formed.