abstracts: engineering 135 



to greater depths not only below an extensive erosion surface but also 

 below the present water level than has previously been considered 

 possible. D. F. H. 



GEOLOGY. — Geology of the Upper Stillwater Basin, Stillwater and 

 Carbon Counties, Montana. W. R. Calvert. U. S. Geological 

 Srn-vey Bulletin 641-G. Pp. 199-214, with 2 plates. 1916. 



The rocks of this area comprise a great thickness of strata ranging 

 from the coal measures of lower Montana (Upper Cretaceous) age to 

 beds more than 8000 feet above the base of the Fort Union formation, 

 of Eocene age. Older sedimentary formations and crystalline rocks 

 are exposed in the Beartooth Mountains, along whose north base 

 there is a profound fault that brings Paleozoic rocks into contact with 

 Tertiary formations south of Red Lodge and with successively older 

 strata to the west. 



The Cretaceous and younger rocks, both sedimentary and igneous, 

 are described, together with the geologic structure, which is simple. A 

 discussion of the coal resources is followed by a statement concerning 

 oil prospects. R. W. S. 



ENGINEERING.— Surface water supply of the United States, 1913, 

 Part X, the Great Basin. Nathan C. Grover, et al. U. S. Geo- 

 logical Survey Water-Supply Paper 360, Pp. 293, with 2 plates. 

 1916. 



Surface water supply of the United States, 1914, Part I, North 

 Atlantic slope basins. Nathan C. Grover, et al. U. S. Geo- 

 logical Survey Water-Supply Paper 381. Pp. 192 and XXXI, 

 with 2 plates. 1916. 



Surface water supply of the United States, 1914, Part II, South 

 Atlantic and eastern Gulf of Mexico basins. Nathan C. Grover, 

 et al. U. S. Geological Survey Water-Supply Paper 382. Pp. 

 66 and XXX, with 2 plates. 1916. 



Surface water supply of the United States, 1914, Part VII, Lower 

 Mississippi River basin. Nathan C. Grover, et al. U. S. Geo- 

 logical Survey Water-Supply Paper 387. Pp. 60 and XXXIV, 

 with 2 plates. 1916. 



Surface water supply of the United States, 1914, Part XII, North 

 Pacific drainage basins, B, Snake River basin. Nathan C. Grover, 

 et al, U. S. Geological Survey Water-Supply Paper 393. Pp. 

 248, with 2 plates. 1916. 



