Vol. 84, No. 3, pp. 13-38 30 June 1971 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON PALEOCENE PRIMATES FROM THE SHOTGUN MEMBER OF THE FORT UNION FORMATION IN THE WIND RIVER BASIN, WYOMING By G. Lewis Gazin Department of Paleobiology, Smithsonian Institution, Washington, D.C. 20560 During the summer of 1959, while carrying on a geologic study of the Shotgun Butte area in the western part of the Wind River Basin in Wyoming, W. R. Keefer of the U.S. Geological Survey discovered a fossiliferous horizon in the Fort Union formation remarkably rich in the remains of verte-brate animals, particularly mammalian teeth. A sample collec-tion was sent to me for study and report, and my tentative list of the Mammalia encountered was included in his report of 1961 (see also Keefer and Troyer, 1964). The original locality is in the SE% of sec. 30, T. 6 N., R. 3 E. ( Keefer, 1965, p. AlO), about 220 feet above the base of the upper part of the Fort Union formation which Keefer ( 1961 ) named the Shotgun member. Gollections by parties from the Smithsonian Institution in 1961 and 1964 were made at the original locality, where the steeply south dipping bed was found to extend from near the Gottonwood Greek road in the south-central part of Section 30 eastward to the northwest slope of a prominent butte in the SE% of section 30. Gollecting by parties from the University of Wyoming and the Museum of Gomparative Zoology have included localities described (Patterson and McGrew, 1962) as in the NE%, SEy2\ sec. 31. A collection made by McKenna iThis has since been corrected by Maclntyre (1966) to read SE14. ^'^^^ ' ''^*^'V/> 3— Proc. Biol. Soc. Wash., Vol. 84, 1971 (13) JUN30t9
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