302 REVIEWS 



folding, faulting, and erosion occurred in post-Adaville (Upper Creta- 

 ceous) time. There was slight folding and faulting after the deposition 

 of the Almy formation (Eocene). After the accumulation of the Green 

 River beds (Eocene) there was a long erosion interval during which the 

 present topographic features were developed. The Eocene, Knight 

 and Green River formations are lake deposits. The Gros Ventre Moun- 

 tains and probably the Wyoming and Salt River ranges had glaciers 

 during a part of Quaternary time. The main disturbance that gave 

 rise to the Gros Ventre Mountains, Hoback Range, Wyoming Range, 

 Meridian Ridge, Salt River Range, and Absaroka Ridge occurred in 

 post-Adaville (Upper Cretaceous) time. 



Coal occurs in the Upper Cretaceous Bear River, Frontier, and Ada- 

 ville formations and in the Cretaceous or Tertiary Evanston formation. 

 Oil is found in the Upper Cretaceous Bear River and Aspen formations. 

 Gold is present in the present stream and bench deposits. The latter 

 only are worked. Phosphate occurs in the Park City formation (Per- 

 mian [ ?]). The sandstone of the Frontier formation (Upper Cretaceous) 

 and also the sandstones and limestones of the older formations would 

 make excellent building-material. Salt springs and salt deposits, as 

 well as rock salt, occur. Salt has been produced for many years. 



V. O. T. 



Geology of the Standing Rock and Cheyenne River Indian Reservations, 

 North and South Dakota. By W. R. Calvert, A. L. Beekly, 

 V. H. Barnett, and M. A. Pishel. Bull. U.S. Geol. Survey. 

 No. 575, 1914. Pp. 49. 

 The Cheyenne River and Standing Rock Indian reservations, as 

 here treated, include the area between the Missouri River and the 

 one hundred and second meridian, and between Cannonball River on 

 the north and Cheyenne River on the south. The object of the survey 

 was the ascertainment of the coal value of the lands. The Pierre shale 

 (Cretaceous-Montana group), which is the oldest formation exposed, 

 covers about one-half of the area. The thickness exposed amounts to 

 650 feet. The Fox Hills sandstone conformably overlies the Pierre. 

 It is the uppermost marine Cretaceous and the youngest formation of 

 the Montana group; it is the most fossiliferous formation of the region. 

 The Fox Hills ranges in thickness from 25 to 400 feet. The Cretaceous 

 or Tertiary Lance formation, which consists of 700 feet of clay, sand- 

 stone, and lignitic shale, unconformably overlies the Fox Hills. Since 



