Stratigraphic sections of the Phosphoria Formation in Wyoming, 1951 Cheney, T. M. (Thomas M.) 1926- creator author. Geological Survey (U.S.) issuing body. U.S. Atomic Energy Commission text dcu 1954 monographic eng remote 1 online resource (24 pages) : map. by T.M. Cheney [and three others]. "This report concerns work done on behalf of the U.S. Atomic Energy Commission and is published with the permission of the Commission." n-us-wy Phosphoria Formation Geology, Stratigraphic Permian Phosphate rock Wyoming Geology, Stratigraphic Permian Geologic Period Phosphate rock Wyoming From 230 to 280 million years ago fast I 19.4/2:324 I 19.4/2:324 Stratigraphic sections of the Phosphoria Formation in Wyoming, 1951 Cheney, T. M. (Thomas M.), 1926-. (OCoLC)5043139 Geological Survey circular ; 324 https://purl.fdlp.gov/GPO/gpo108469 COP 160708 20190122121025.0 in00004011221 eng