Gary,

The Florissant Fossil Beds date from the late Eocene, around 36 million years 
ago.  This post dated the last of the Laramide Orogeny and was in a basically a 
period of erosion and sedimentation in the area through the onset of post 
Laramide volcanism in the area.  In general the climates was very much wetter 
and warmer than it is today. Ice ages did not really begin until some fits and 
starts perhaps 7 million years ago, and the multiple glaciations episodes of 
the Pleistocene for the last million years.

Ed

"To the attentive eye, each moment of the year has its own beauty, and in the 
same field, it beholds, every hour, a picture which was never seen before, and 
which shall never be seen again" - Ralph Waldo Emerson

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