Geology and Mineralogy. 485 



No. 549. The Shinumo Quadrangle ; Grand Canyon District, 

 Arizona; by L. F. Noble. Pp. 100; 18 pis. (map in pocket), 

 1 fig. 



No. 550. The Ore Deposits of Northeastern Washington; by 

 Rowland Bancroft; including a section on the Republic Min- 

 ing District; by Waldemae Lindgren and Howl and Bancroft. 

 Pp. viii, 215; 19 pis., 26 figs. 



No. 552. Results of Triangulation and Primary Traverse in 

 Ohio, 1898 to 1911, inclusive. R." B. Maeshall, Chief Geogra- 

 pher. Work from 1900 to 1911, inclusive, done in cooperation 

 with the State. Pp. 232; 2 pis. 



No. 556. Results of Spirit Leveling in Oregon, 1896 to 1913, 

 inclusive. R. B. Marshall, Chief Geographer. Work done in 

 cooperation with the State from 1905 to 1913, inclusive ; John 

 II. Lewis, State Engineer. Pp. 175; 1 pi. 



No. 557. Results of Spirit Leveling in the State of Washing- 

 ton 1896 to 1913, inclusive. R. B. Marshall, Chief Geographer. 

 Work from 1909 to 1913, inclusive, done in cooperation with the 

 State. Henry Landes, State Geologist. Pp. 178; 1 pi. 



No. 571. Results of Spirit Leveling in Kansas, 1896 to 1913, 

 inclusive. R. B. Marshall, Chief Geographer. Pp. 47; 1 pi. 



No. 574. Mining Districts of the Dillon Quadrangle, Montana, 

 and adjacent Areas; by Alexander N. Winchell. Pp. 191; 

 8 pis., 16 figs. 



No. 577. Geology of the Phosphate Deposits Northeast of 

 Georgetown, Idaho ; by R. W. Richards and G. R. Mansfield. 

 Pp. 77; 14 pis., 3 figs. 



No. 578. The Iditarod-Ruby Region, Alaska; by Henry M. 

 Eakin. Pp. 45; 6 pis. (3 maps in pocket), 1 fig. 



No. 579. Reconnaissance of Oil and Gas Fields in Wayne 

 and McCreary Counties, Kentucky; by M. J. Munn. Pp.105; 

 6 pis., 6 figs. 



No. 580. Contributions to Economic Geology, 1913. Part I. 



D. The Grand Gulch Mining Region, Mohave County, Arizona; 

 by James M. Hill. Pp. 39-58; 5 figs. E. A New Gypsum 

 Deposit in Iowa; by George F. Kay. Pp. 59-64; 1 fig. F. 

 Deposits of Mica in the United States; by Douglas B. Sterrett. 

 Pp. 65-125; 33 figs. G. Gold Placers on Wind and Bighorn 

 Rivers, Wyoming; by Frank C. Schrader. Pp. 127-145; 1 pi., 

 1 fig. H. Carnotite near Mauch Chunk, Pennsylvania; by Edgar 

 T. Wherry. Pp. 147-151. I. Lode Deposits of the Alleghany 

 District, California; by Henry G. Ferguson. Pp. 153-182; 7 

 figs. J. The Phosphate Deposits of South Carolina ; by G. 

 Sherburne Rogers. Pp. 183-220; 1 pi., 2 figs. K. Ore Deposits 

 in the Sawtooth Quadrangle, Blaine and Custer Cos., Idaho; by 

 J. B. Umpleby. Pp. 221-249; 2 pis., 1 fig. 



No. 581. Contributions to Economic Geology. Part II. A. 

 Oil Shale of Northwestern Colorado and Northeastern Utah; by 



E. G. Woodruff and David T. Day. Pp. 21; 1 pi. B. Oil 

 and Gas in the Western Part of the Olympic Peninsula, Wash- 



