ABSTRACTS: GEOLOGY 319 



The rocks overlying the Jurassic unconformably are correlated with 

 the Wasatch formation of Echo Canyon, and consist of an upper and a 

 lower conglomerate and intervening sandstone and shale. 



The structure of the Jurassic formation is intricate and complicated. 

 The rocks are highly folded and may be faulted. 



The Wasatch beds were laid down on the truncated edges of the Juras- 

 sic rocks and are now generally flat lying. 



The coal in the Lost Creek field occurs in small areas and is generally 

 too thin to be of economic value. 



The lyost Creek coal, being inferior in rank to subbituminous coal of 

 nearby fields, is not hkely to receive serious attention. 



R. W. Stone. 



GEOLOGY. — A geologic reconnaissance for phosphate and coal in south- 

 eastern Idaho and western Wyoming. AlfrEd Reginald 

 ScHULTz. U. S. Geol. Survey Bull. 680. Pp. 8i, 2 plates, 8 

 figures. 1918. 

 Describes fully the stratigraphy of the region, embracing a geologic 

 column from pre-Cambrian to Quaternary; describes the geologic 

 structure briefly. The occurrence of phosphate rock in several localities 

 is given in such detail as is possible from reconnaissance examination 

 only, but it is apparent that in the Snake River Range, Bighole Moun- 

 tains, and Teton Range, particularly along the east side of Teton Basin, 

 a large amount of phosphate is present. The analyses show considerable 

 variation but they indicate the presence of some high-grade ore that 

 contains approximately the equivalent of 70 per cent of tricalcium phos- 

 phate. Beds of coal have been found at several localities in this field 

 and are at present being mined in a few places. Most of the coal beds 

 that have been exploited are of Cretaceous age, belong to the Frontier 

 formation, and represent the northward extension of the coal beds 

 which are so extensively developed and on which active mines are lo- 

 cated in southern Lincoln County, Wyoming. Beds of coal are also 

 found in rocks stratigraphically below the Frontier formation, which 

 probably represent the Bear River coals that have been prospected in 

 the vicinity of Sage, Wyoming, but on which no active mines are 

 located. The coal is bituminous and rather free from impurities, and 

 occurs in beds i to 4 feet thick. According to report some of it has 

 been coked with fair success. Most of the coal is badly shattered, as 

 would be expected in a region where so much faulting has taken place. 

 Several sections and analyses are given. R. W. Stone. 



