1982. 2016-01-07T20:49:32Z. 2016-07-13T21:10:34Z. Hosman, R. L. The Survey. English. cartographic image. Public. Arkansas, U.S., and Arkansas. Tertiary and From 2 to 65 million years ago.
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1987. 2018-04-20T19:56:20Z. 2018-09-05T19:42:20Z. University of Texas at Austin. Bureau of Economic Geology. University of Texas at Austin, Bureau of Economic Geology. English. cartographic image. Public. Texas, Texas Panhandle, and Texas Panhandle. Tertiary and From 2 to 65 million years ago.