fe Bulletin American Museum of Natural History. [Vol. XXXIV, 
Wasatch and Wind River and their equivalents. Preliminary notes on 
the stratigraphy and correlation have been published by Sinclair and 
Granger, and the Artiodactyls have been revised in a recent paper by Dr. 
Sinclair in this ‘Bulletin.’ The systematic revision of the Amblypoda, 
Condylarthra, Perissodactyla, Tillodontia and Tzeniodonta has been under- 
taken by Mr. Granger, of the Carnivora, Insectivora, Primates, Rodents, 
ete.. by Dr. Matthew. Dr. W. K. Gregory will contribute a series of 
studies of the morphology and general relationships of some of the more 
important groups. 
Through the courtesy of the United States National Museum, we have 
been accorded the exceptional privilege of borrowing for study and com- 
parison the type specimens of fossil mammals from the New Mexican 
_ Wasatch described by Cope in 1874-77. The rest of the types from the 
Lower Eocene formations are in this museum, except for a number in the 
Amherst Museum and in the Marsh Collection at Yale University. Through 
the courtesy of Dr. Loomis, Dr. Schuchert and Dr. Lull we have been en- 
abled to examine and study these types also. The Museum is largely 
indebted to Dr. W. J. Sinclair of Princeton University for valuable services 
in the field, both in stratigraphic work and collecting, as well as for the pub- 
lished contributions above noted. The success of Mr. Granger’s expeditions 
is in no small part due to the codperation of his able and energetic assistants 
now or formerly on the Museum staff, Messrs. George Olsen, William Stein, 
Paul Miller, C. Forster Cooper and P. L. Turner, who have been attached to 
one or more of the parties in the Lower Eocene formations. Following is a 
summary of the earlier and later explorations in these horizons: 
(1) Typical Wasatch, near Evanston, Wyoming. Fossils first found in 
1871 by Wm. Cleburne. These and some other specimens obtained in 
1872-73 by Professor Cope are in the American Museum collection. A 
number of specimens were secured subsequently by Professor Marsh and 
are now in the Yale Museum. Systematically explored by Granger in 
1906,' and a small collection secured. The exposures are limited and fossils 
scarce. 
(2) New Mexican Wasatch. San Juan Basin, in Rio Arribas Co. Ex- 
plored by Cope for the Wheeler Survey in 1874 and an important collection 
made which is now in the U. S. National Museum. A few specimens 
_ collected for Professor Marsh about 1875-76 are in the Yale Museum. Dr. 
Wortman conducted a party in these beds in 1896 for the American Museum, 
but only a few specimens of any value were obtained. Systematically ex- 
plored by Granger in 1912 and 1913 with considerable success. 
1 The stratigraphy was revised by Veatch in 1904 for the U. 8. Geological Survey. 
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