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.
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1983. 2014-04-01T14:58:36Z. 2014-04-15T22:13:38Z. Luedke, Robert G. Dept. of the Interior, U.S. Geological Survey. English. Public. Idaho, Montana, Western, South Dakota, and Wyoming. Cenozoic.