PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Vol. 83 Washington : 1935 No. 2981 NEW PALEOCENE MAMMALS FROM THE FORT UNION OF MONTANA By George Gaylord Simpson American Museum of Natural History, New York City In 1901, Earl Douglass, working for Princeton University, dis-covered and collected mammal remains in the Fort Union Group east of the Crazy Mountains in central Montana, and Princeton expedi-tions under Dr. M. S. Farr also made small collections in 1902 and 1903. A. C. SiJberUng, now of Harlowton, Mont., accompanied these expeditions, and ever since then he has continued to collect in this field. Some of his earlier material went to the Carnegie Museum, and recently some has been acquired by the American Museum of Natural History, but most of it is in the United States National Museum. The largest collections were made by him from 1908 to 1911, under grants from the United States Geological Survey and the National Museum. The result is one of the richest, most varied, and most important Paleocene mammal collections ever made. The late Dr. James W. Gidley, assistant curator of fossil mammals in the National Museum, visited the field in 1909. Concurrently with his other duties and interests. Dr. Gidley set about the long task of preparing the specimens in the National Museum, and essen-tially completed it in 1920. He published four papers based on or including part of this material, ^ and he planned to publish a memoir ' Notes on the fossil mammalian genus Plilodus, with descriptions of new species. Proc. U. S. Nat. Mus. vol. 36, pp. 611-626, 1909. An e.xtinct marsupial from the Fort Union with notes on the Myrmecobidae and other families of this group. Proc. U. S. Nat. Mus., vol. 48, pp. 395-402, 1915. New species of claenodonts from the Fort Union (Basal Eocene) of Montana. Bull. Amer. Mus. Nat. Hist., vol. 41, pp. 541-555, 1919. Paleocene primates of the Fort Union, with discussion of relationships of Eocene primates. Proc. U. S. Nat. Mus., vol. 63, art. 1, pp. 1-38, 1923. 12697—35 1 221
BioStor
