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Three million years ago would make it the Pliocene, not the Eocene (56 - 35 million years ago). I see that that figure came from http://ohp.parks.ca.gov/ListedResources/Detail/915. Unless there's something about the Petrified Forest that I don't know, this latter site is also in error. See http://www.petrifiedforest.org. 66.81.52.188 (talk) 05:41, 7 December 2014 (UTC)