8 SMITHSONIAN INSTITUTION 



way up the mountain. The layer is best exposed in the saddle between 

 the buttes, and while working at this point we were surprised to find 

 an old Indian camp site of considerable extent, as indicated by 

 numerous large circles of rocks. The pattern of the rocks was not 

 conspicuous at close range, but from points higher on the buttes a 

 large number of the teepee circles could be made out. 



Further investigation of Twin Buttes showed rather profitable 

 collecting to the northeast, and a second camp was made near the 

 Green River-Manila road. The search was most successful in the 

 lower exposures radiating from the buttes, not far above the under- 

 lying Green River formation. A few good skeletons were found and 

 notably a nearly perfect, uncrushed skull of a small, ancient carnivore 

 known as Thinocyon. 



After nearly a month of working around Twin Buttes, curiosity 

 prompted us to have a try at Bridger exposures on the east side of 

 the basin, so our next camp was made near Grizzly Buttes, at a site 

 occupied by Gilmore's party in 1930. A fair amount of material was 

 discovered, in particular the remains of a primitive titanothere, 

 Palaeosyops, and a good number of jaw portions of various small 

 mammals. 



Extending operations farther away from Grizzly Buttes, we soon 

 discovered that collecting was particularly good in the extensive bad- 

 lands not far from Lone Tree, especially near the divide between 

 Henry's Fork and the easterly branch of Sage Creek. As a conse- 

 quence, toward the middle of August our last camp was made at a 

 place in the upper part of Sage Creek. We were unusually fortunate 

 in finding, practically on the divide, the greater part of a skeleton of 

 the gigantic amblypod known as an uintathere, a mammal with six 

 horns, saberlike tusks, and nearly equaling in size a modern elephant. 

 The only parts of the skeleton of this beast conspicuously absent were 

 the neck, a shoulder blade, the right hind limb, and the lower jaws, 

 although pieces of the latter together with portions of one of the 

 fore limbs were found scattered on the surface. It is anticipated that 

 this individual will prove worthy of being mounted for exhibition in 

 the National Museum. 



We were particularly favored this season in having weather that 

 permitted so many working days ; however, the last week of August 

 began with a series of heavy rains and cold weather, letting up only 

 toward the end of the week, so that it became possible for us to 

 complete the taking up and removal of specimens upon which work 

 had begun the previous week. On August 30 we moved our equip- 

 ment and the specimens on hand to the town of Green River, where 

 the accumulated collection was packed and shipped. 



