SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 



Bulletin 169 



THE FORT UNION OF THE 



CRAZY MOUNTAIN FIELD, MONTANA 



AND ITS MAMMALIAN FAUNAS 



BY 



GEORGE GAYLORD SIMPSON 



American Museum of Natural History 

 New York City 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1937 



For sale by the Superintendent of Documents, Washington, D. C. ----- Price 45 cent* 



