1978. 2014-03-28T13:58:04Z. 2014-04-08T22:10:30Z. Luedke, Robert G. Dept. of the Interior, U.S. Geological Survey. English. Public. Arizona, New Mexico, and U.S. Cenozoic and From 65 million years ago.
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1978. 2014-04-01T14:46:02Z. 2014-04-15T22:13:36Z. Luedke, Robert G. Dept. of the Interior, U.S. Geological Survey. English. Public. Colorado, Utah, and Wyoming. Cenozoic and From 65 million years ago.