REVIEWS 301 



Under mineral resources the oil and gas districts are described in 

 detail with a number of well-records from each district. Statistics on 

 coal production place Kanawha County third in rank of the counties 

 of the state for 1912, with a total of 5,606,522 tons. This chapter 

 treats also of the character and distribution of the coal beds with esti- 

 mates on the total supply. Clays and road and building-materials are 

 reported in less detail. A chapter on the soils of the county is copied 

 from the report of the U.S. Bureau of Soils on Kanawha County. 



Under separate cover three maps accompany this report, a topo- 

 graphic map, a general and economic geology map, and a soil map. 

 A valuable feature of the economic geology sheet is found in the struc- 

 ture contours. The Pittsburg coal horizon is the key formation in the 

 western part, and the Kanawha Black Flint in the eastern. This map 

 shows several areas in which the geologic structure appears favorable 

 for oil and gas, that have not been prospected. 



W. B. W. 



Geology and Geography of a Portion of Lincoln County, Wyoming. 

 By Alfred Reginald Schultz. Bull. U.S. Geol. Survey, 

 No. 543, 1914. Pp. 136. 



The area described lies in the central part of Lincoln County in the 

 extreme western part of Wyoming, east of the Salt River Range and west 

 of Green River. Under the head of geography are discussed geographic 

 positions, topography, altitudes, railroad and stage routes, geographic 

 names, climate, arable land, and vegetation. The stratigraphic succes- 

 sion, beginning with the oldest rocks, is as follows: Cambrian, undivided 

 (Ordovician, Silurian (?), and Devonian), undifferentiated Pennsylva- 

 nian and Mississippian, Pennsylvanian (Weber quartzite), Permian (?) 

 (Park City formation), Lower Triassic (Woodside formation, Thaynes 

 limestone, Ankareh shale), Jurassic or Triassic (Nugget sandstone), 

 Jurassic (Twin Creek limestone, Beckwith formation), Upper Cretaceous 

 (Bear River formation, Colorado group [Aspen formation, Frontier 

 formation, Hilliard formation], Montana group [Adaville formation]), 

 Cretaceous or Tertiary (Evanston formation), Eocene (Wasatch group 

 [Almy formation, Knight formation, Green River formation]), Quaternary 

 (Pleistocene and Recent). 



Deposition was interrupted possibly at several times in the early 

 Paleozoic. An unconformity based on fossil evidence, which shows the 

 lower Cretaceous to be absent, occurs between the Beckwith formation 

 (Jurassic) and the Bear River formation (Upper Cretaceous). Profound 



