I did not realize how much of Colorado, Wyoming and Utah had once in their territories ancient lakes. Fossil Butte is the result of Fossil Lake which was 50 miles long and 20 miles wide at its maximum some 50 million years ago. The fossils that had turned into the rocks today are known as the Green River formation. The formation is made up of laminated limestone, mudstone and volcanic ash. We had visited Florissant fossil beds in Colorado and now after this visit here we have a much better understanding of fossils and their importance in scientific studies. It amazes us the details of many of the fishes, i.e., retain not only their entire skeleton but their teeth, delicate scales and skin as well.
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