Oceans
There is evidence from oxygen isotopes at Deep Sea Drilling Program sites that ice began to build up in Antarctica about 36 Ma during the Eocene. Further marked decreases in temperature during the Middle Miocene at 15 Ma probably reflect increased ice growth in Antarctica. It can therefore be assumed that East Antarctica had some glaciers during the early to mid Miocene (23–15 Ma). Oceans cooled partly due the formation of the Antarctic Circumpolar Current, and about 15 million years ago the ice cap in the southern hemisphere started to grow to its present form. The Greenland ice cap developed later, in the Middle Pliocene time, about 3 million years ago.
Read more about this topic: Miocene
Famous quotes containing the word oceans:
“You there, I here,
With just the door ajar
That oceans are,
And prayer,
And that pale sustenance,
Despair!”
—Emily Dickinson (1830–1886)
“It is a noble land that God has given us: a land that can feed and clothe the world; a land whose coastlines would enclose half the countries of Europe; a land set like a sentinel between the two imperial oceans of the globe.”
—Albert J. Beveridge (1862–1927)
“From the mountains to the prairies,
To the oceans white with foam,
God bless America,
My home sweet home!”
—Irving Berlin (1888–1989)