Publications of the United States Government. 39 



Report of 1877. Geological report on the portions of Western 

 Nevada and Eastern California between the parallels 

 30° -30' and 38° 30'; by A. R. Conkling. Report of Chief 

 of Engineers, 1877, Appendix H, pp. 1285-1295. 



The area examined is bounded on the nortli by a line drawn 

 through Truckee, Cal., and Washoe City, Nev.; on the east by the 

 Mount Davidson range and the Como Mountains ; on the south by 

 Job's Peak and Pj'ramid Peak ; and on the west by the Western sum- 

 mit and the Truckee Rivers. Nearly all this region is covered by 

 granites, with occasional outbursts of basaltic rocks. No fossils were 

 found, except at Carson City, at the State Prison quarries. 



U. S. GEOLOGICAL AND GEOGRAPHICAL SUR- 

 VEYS OP THE TERRITORIES. 



F. V. HAYDEN, U. S. Geologist, in charge. 



Twelfth Annual Report of the U. S. Geological and Geograph- 

 ical Survey of the Territories. A report of progress of 

 the exploration in Wyoming and Idaho for the year 

 1878. In two parts. Part I. Washington, 1883. 



On page 132, Dr. White describes Productus gigaiiteus, Martin, from 

 McCloud River, Shasta County, California. 



UNITED STATES GEOLOGICAL SURVEY. 



J. W. POWELL, Director. 

 Report for 1883-84; by Albert Williams. 



Contains : Report on coal fields of L^^nited States, pp. 14-143 ; Iron 

 on the Pacific Coast, by C. G. Yale, pp. 286-290 ; Quicksilver reduction 

 at New Almaden, by S. B. Christy, pp. 503-534; The asphaltum 

 deposits of California, by E. W. Hilgard, pp. 938-948; with reports on 

 other minerals. 



Sixth Annual Report, 1884-85. Division of Mesozoic Inverte- 

 brates, by Charles A. White, pp. 72-74. 1885. 



The author states his conclusions in regard to the Chico and Tejon 

 groups, and the auriferous slate series of California. He gives the 

 name. of Wallala group to a Cretaceous formation in Mendocino 

 County. 



