NO. I LOWER EOCENE MAMMALIAN FAUNAS — GAZIN 3 



the Fossil Basin, uncovering new localities in the local basin to the 

 west and southwest of Elk Mountain in addition to those previously 

 known around Fossil Butte and in the vicinity of Knight Station. A 

 summary of these investigations was prepared for the 1959 guidebook 

 of the Intermountain Association of Petroleum Geologists for their 

 field conference relative to the Wasatch and Uinta Mountains. 



ACKNOWLEDGMENTS 



Among the many who have been of assistance to me in this restudy 

 of these faunas, I am particularly indebted to the following: 



Dr. Joseph T. Gregory, while at Yale University, kindly turned 

 over to me for inclusion in this investigation the interesting collection 

 of unstudied materials made near Bitter Creek by O. C. Marsh's par- 

 ties. Dr. Peter Robinson supplemented this by sending me from 

 time to time occasional specimens of this collection later encountered 

 during his curatorial work on the Eocene mammals of the Marsh 

 Collection. Dr. Glenn L. Jepsen, in addition to permitting me access 

 to various lower Eocene collections at Princeton University, was 

 most helpful in lending me for review the collections of lower 

 Eocene mammals from the Washakie Basin. The latter were made 

 by Dr. William J. Morris and included specimens representative of 

 both the Dad and Cathedral Bluffs faunas. Dr. Malcolm C. Mc- 

 Kenna, while a student at the University of California, sent me for 

 study a collection of teeth that his party made in beds beneath the 

 Tipton tongue near Dad, during the time of their work at the Four 

 Mile Creek locality in nearby Colorado. I was also permitted, through 

 the kindness of Drs. M. Graham Netting and J. LeRoy Kay, to ex- 

 amine the Dad locality materials collected by Kay. These were the 

 specimens reported but not seen by me in 1952. More recently I have 

 been privileged to examine for report several small collections made 

 by Henry W. Roehler of the Mountain Fuel and Supply Co. from a 

 series of carefully documented localities in lower Eocene strata of 

 various horizons on the flanks of the Rock Springs uplift. Dr. Paul 

 O. McGrew of the University of Wyoming has also aided in furnish- 

 ing me with selected artiodactyl and primate specimens of particular 

 interest that University of Wyoming parties obtained at various 

 localities in the region. 



During the faunal study I have been permitted unrestricted access 

 to the type and other comparative materials in the collections of the 

 American Museum, through the courtesy of Drs. George G. Simpson, 

 Edwin H. Colbert, and Bobb Schaeffer. Mrs. Rachel H. Nichols, 



