This is one of the newest national monuments,established in 1975. It’s contains one of the richest fossil beds in the world with a continuous record of fossils spanning 40 million years from 54 million to 6 million years ago.
More pictures here: http://cid-4ce32117b0082fb8.skydrive.live.com/browse.aspx/.res/4CE32117B0082FB8!
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