20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Esthonyx in the Cathedral Bluffs, but the gap between them in their 

 stages of development seems too great for direct continuity in the 

 time permitted. Palaeosyops? fontinalis, on the other hand, is scarcely 

 more than a large Eotitanops. 



Oregon Buttes. — In addition to the brontotheriid, near Palaeo- 

 syops? fontinalis, and Trogosus discussed in the above section on 

 the Cathedral Bluffs, remains of Notharctns, Hyrachyus, and a 

 tapiroid which has been thought to represent Heptodon have been 

 found in the northwestern part of the Continental Divide Basin, in 

 the general area of the Oregon Buttes and Continental Peak. The 

 Cathedral Bluffs sequence here beneath the lacustrial zone which 

 was mapped as "Morrow Creek" (now Laney) consists essentially 

 of a lower red zone and an upper greenish portion. Part of the 

 specimens collected by us came from a level at about the color change 

 to a few feet higher, but the tapiroid and Notharctus came from red 

 beds on the northwest side of Oregon Buttes. These few specimens 

 give no clue as to whether the age represented is that of the Lost 

 Cabin or Bridger beds. The brontotheriid is a trifle more robust 

 than that represented by the Princeton specimen from the Washakie 

 basin, and the Heptodon-like tapiroid could be Helaletes. The possi- 

 bility that the color change here represents the transition from 

 Cathedral Bluffs to Bridger makes interesting speculation, particu- 

 larly since the overlying Laney is so attenuated. It should be noted, 

 however, that much of the New Fork sequence of undoubted Wa- 

 satchian age is essentially greenish with locally reddish zones or lenses. 



Rock Springs uplift. — In 1952 I reported the discovery by Roland 

 W. Brown of Meniscotherium rohtistum and Coryphodon in the 

 Knight a few miles southwest of Rock Springs. Since then Henry 

 W. Roehler, geologist for the Mountain Fuel and Supply Co. in Rock 

 Springs, has discovered a series of small faunules at various horizons 

 in the "Hiawatha" member on the west flank of the uplift near here. 

 These included representation of horizons from earliest Graybullian 

 Eocene to Lostcabinian, with about 930 feet belonging to the Gray Bull 

 equivalent. This was reported by McGrew and Roehler in i960. 

 A similar sequence of faunules, represented mostly by small isolated 

 teeth, has been found by Roehler on the southeast flank as well, also 

 demonstrating earliest Wasatchian to Lost Cabin time. The lowest 

 faunules here are in beds that strike to the southwest from the Bitter 

 Creek locality. I am particularly indebted to Mr. Roehler for allowing 

 me to study and report on these collections. I look forward to seeing 

 publication of his stratigraphic studies. 



