Roberts (1/14)
Have to chime in on this one. There have been numerous ice ages, in fact,
they've been occuring around every 150 million years (lasting several
million years each), since about half-way
through the Precambrian (approx. 2.3 Billion years ago). They're so
common that geology is only concerned with the most major ones.
For instance, notable ice ages occured
Near the end of the Precambrian (600 M years ago),
During the Paleozoic era
Ordovician period (approx. 435 M years ago)
Conrboniferous period (approx. 300 M years ago, extending through
the Permian period)
and of course the last one, which closed the Pleistocene epoch (10
thousand years ago).
Information regarding the timetables of geology, and the causes and
duration of ice ages can be found in any high-school level
introductory geology text.
Peace,
Jeff
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Jeff Roberts
Dept. of Computer Science, strider@acm.org
Ashland University strider@pobox.com
Ashland, OH http://www.ashland.edu/~jroberts
EAT VEGETARIAN--for your health and the environment!
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Faith, n:
That which allows us to believe what we know to be untrue.
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