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1972. 2012-11-02T20:06:19Z. 2012-11-02T20:06:19Z. Haynes, Donald D. U.S. Geological Survey. English. Public. Colorado, Dolores County, Montezuma County, San Miguel County, Utah, and San Juan County.
2002. 2002-09-20T18:12:30Z. 2016-07-26T21:19:13Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. Colorado, Piceance Creek Basin, Uinta Basin (Utah and Colo.), Mancos Shale., Mesaverde Group., Piceance Creek Basin., United States, and Uinta Basin. Cretaceous. and From 65 to 140 million years ago.
2002. 2002-09-20T14:59:09Z. 2011-03-03T23:19:15Z. Geological Survey (U.S.). U.S. Geological Survey : For sale by the USGS Information Services (Open-File Report Sales). English. Public. Animas River Watershed (Colo. and N.M.), Colorado, and Silverton Region.