INDEX. 
221 
(Clay— Continued. 
United States; Ries, 2057; 2418, 2419. 
Vermont : Richardson, 2037. 
Virginia : Ries, 2060, 2064. 
West Virginia : Grjimsley, 1044. 
Pan Handle counties: Grimsley, 
1040. 
Wisconsin : Ries, 2059. 
Milwaukee quadrangle : Alden, 23. 
Wyoming, Bighorn basin : Fisher. 872. 
Laramie basin : Siebenthal, 2209. 
Cleavage. 
Theories of: Barrell, 140; Becker. 17.". ; 
Willis, 2596. 
Coal. 
General. 
Appalachian and eastern interior 
coal fields, relat ions : Ashley, 70. 
Classification: Frazer, 899. 
Coal fields, formation of: Ford, 887 ; 
Page, 1858. 
Coal-testing: Holmes et al., 1 1! 14; 
Parker et al., .1870. 
Composition: Grout, 1040. 
Correlation of coals : White and 
Ashley, 2549. 
Deposition, rate of: Ashley, 75. 
' maximum, in Appalachian field : 
Ashley, 74. 
Formation of: Plotts, 1938; White, 
2548. 
Origin of different grades : Campbell, 
397 : Smith, 2252. 
Alabama : Smith, 2227. 
Cahaba field : Butts, 373. 
Warrior basin : Butts, 300. 
Alaska : Brooks, 311 ; Ritter, 2069. 
Admiralty Island : Wright, 2640. 
Bering River field: Martin, 1680. 
Bonnifield and Kantishna region: 
Prindle. 1957. 
Cape Llsburne region : Collier. r>."i2. 
Circle Precinct: Brooks. 310. 
Herendeen Bay field : Paige, 1859. 
Kachemak Bay region : Stone, 2308. 
Matanuska field: Grifl&th, 1042; 
Martin, 1681, 1682; Paige and 
Knopf, 1861, 1862. 
southeastern: Wright, 2360. 
Talkeetna basin : Paige and Knopf, 
1861, 1862. 
Yakutat Bay region : Tarr, 2346. 
Yukon region : Prindle. 1955. 
Alberta: Denis, 710; Bowling. 734, 
737 ; Gwillim, 1059 ; Thompson, 
2371. 
Cascade coal basin : Dowling. 736. 
Moose Mountain district: Cairnes, 
381. 
Arizona : Griffith, 1041. 
Arkansas: Collier. 555, 556; Griffith, 
0)11. 
British Columbia: Denis. 710; Ritter, 
2060; Robertson. 2074. 
Cassiar field : Bell, 188. 
Crow's Nest field : Ashworth, 78. 
Elk River basin : Dowling, 733. 
Coal — Continued. 
British Columbia, Graham Island: 
Ellis. 781, 783. 
Nanaimo-Comox field: Poole. 1939. 
Nicola-Coldwater beds: Evans, 813. 
Princeton held : Lakes. 1480. 
Skeena River : Leach, 1535. 
Telkwa district: Leach, 1533, 1534. 
California; Edwords, 777; Ritter, 
2069. 
Monterey County: Arnold, 58; 
Campbell, 405. 
Canada: Ells, 785; Ingall, 1267. 
Colorado: 562; Headden, 1117, 1118; 
Lakes, 1 10 1. 1466, l 170 ; Mer- 
riam, 1718 ; Ritter. 2069. 
Book Cliffs field: Richardson, 2045. 
Danforth Hills and Grand Hogback: 
Gale, 924. 
Durango district: Taff, 2336. 
Durango-Gallup field: Shaler, 2176. 
northwestern : wale, 924. 
Quray quadrangle: Cross et al., 607. 
Routt County: Fenneman and Gale, 
sol'. 863; Lakes, 1469. 
Yampa held : Campbell, 400 ; Fen- 
neman and Gale, 862, 863. 
Idaho : Ritter, 2069. 
Illinois: Bain, 100, 112; Bement, L'lt] ; 
Parr, 1875-1877. 
cannel coal in northern Illinois: 
Grout, 1050. 
Sabine-Gallatin field: DeWolf, 717. 
Indian Territory : Crane, 592. 
Iowa : Beyer, 229 ; Savage, 2126. 
Kansas, Atchison : Y'oung, 2650. 
Independence quadrangle : Schrader 
and Haworth. 2144. 
Kentucky, Big Sandy Valley: Crandall, 
589. 
Cumberland Gap field : Ashley and 
Glenn, 77: Pultz, 1004. 
Elkhora field : Stone. 2310. 
Kenova quadrangle : Phalen, 1920. 
Manitoba : Dowling, 737. 
Maryland: Clark and Mathews, 488. 
George's Creek field: Parsons, 1879. 
Mexico: Guerra, 1051; Ritter, 2069; 
Thomas, 2368, 
Coahuila : Ludlow. 1628. 
Michigan : Eraser. 896, 897. 
Bay County : Cooper, 575. 
Montana: Leonard, 1560; Parsons. 
1883 : Ritter, 2069 : Rowe, 2090- 
2<i02; Tarr, 2345. 
Bear Creek field : Fisher, 871. 
Carbon County : Darton, or,!'. 
Dawson. Rosebud, and Custer coun- 
ties : Leonard, 156 l. 
Great Falls field : Fisher. S74. 
Nebraska. Honey Creek mine: Barbour. 
1:12. 
Peru : Barbour, 137. 
Nevada, Silver Peak quadrangle : Spurr. 
L'L'71. 
New Mexico: Griffith. 1041; Ritter, 
2060; Sheridan. 2105. 
