UINTA MOUNTAIN SECTION. 57 



consider the Tonto, Red Wall, Lower Aubrey, and Upper Aubrey Groups 

 to represent the Carboniferous time from base to summit. 



In Figure 10 I give a Uinta Mountain, Cataract Canon, and Grand 

 Caf5 on section of these groups, side by side, for comparison. The Uinta 

 Mountain and Cataract Canon Sections were made by Mr. J. F. Steward. 



UINTA MOUNTAIN SECTION. 



By J. F. STEWARD. 

 UPPER AUBREY GROUP. 



No. 1, 175 feet. Calciferous sandstone, containing Bdlerophon, con- 



chifers, &c. 



No. 2, 1,400 feet. Massive buff sandstone. 



LOWER AUBREY GROUP. 



No. 3, 90 feet. Limestone, mottled dark, drab, and buff; very hard; 

 cup corals and Product us abundant. 



No. 4, 200 feet. Buff limestone, very fossiliferous ; Spirtfer, Atliyris, &c., 

 abundant. 



No. 5, 75 feet. Heavy bedded, bluish-drab limestone ; lower portion 

 buff colored. This bed is filled with nodules of chert, (red, pink and purple 

 chalcedony;) also abounds in remains of cyathophylloid corals, Spinfer, 

 and Productus, all siliceous. 



No. 6, 90 feet. Thinly bedded rocks, often shaly ; texture variable ; 

 composition calcareous, arenaceous, and argillaceous. 



No. 7, 180 feet. Compact buff sandstone ; very-hard. 



No. 8, 20 feet. Dark bluish-drab limestone ; very hard. 



No. 9, 150 feet, Light pinkish-buff, fine grained sandstone. 



RED WALL GROUP. 



No. 10, 750 feet. Heavy bedded limestone, of pinkish-drab color, be- 

 coming arenaceous toward the top, and of a bright red color. , 



No. 11, 150 feet. Reddish, compact, and shaly sandstones. 



No. 12, 185 feet, Pinkish, purple, brown, and bluish limestone, colored 

 pink on the surface by oxide of iron from the overlying sandstone. 



