238 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Igneous and. volcanic rocks — Continued. 
Mexico: Guild, 1052; Philippi, 1924; 
Villafaiia, 2447. 
Colima : Waitz, 2466. 
Guaynopita district : Hovey, 1224. 
Jorullo : Ordonez, 1831. 
Puebla : Ordonez, 1826. 
Sierra de Concepcion del Oro : Burck- 
hardt, 357. 
Sierra de Guanajuato : Villarello, 
Flores, and Robles, 2460. 
Sierra de Mazapil et Santa Rosa : 
Burckhardt, 358. 
Sierra Madre Mountains : Warwick, 
2479. 
Xinantecatl : Flores, 881. 
Zacatecas : Burckhardt and Scalia, 
363. 
Michigan : Lane, 1513. 
Black River section : Gordon and 
Lane, 985. 
Montana, Marysville district : Barrell, 
149. 
Purcell Mountain Range : Daly, 631. 
Nevada, Goldfield mining district : 
Hastings and Berkey, 1091. 
Pioche : Pack, 1854. 
Robinson mining district : Lawson, 
1526. 
Silver Peak quadrangle : Spurr, 
2271. 
southwestern : Ball, 120. 
New Brunswick : Ells, 784. 
New Hampshire, Belknap Mountains : 
Pirsson and Washington, 1934. 
Red Hill : Pirsson and Washington, 
1935. 
New Jersey, Newark rocks : Lewis, 
1579, 1580, 1583. 
New Mexico, Mount Taylor region : 
Johnson, 1304. 
Rio Grande Valley : Lee, 1545. 
New York, Adirondacks : Cushing, 616. 
Highlands: Berkey, 207. 
Long Lake quadrangle : Cushing, 
614. 
Palisade trap : Julien, 1340. 
North Carolina, Pisgah quadrangle : 
Keith, 1353. 
Roan Mountain quadrangle : Keith, 
1354. 
Ontario : Coleman, 546. 
Animikie iron range : Silver, 2212. 
Lake Nipigon iron ranges : Coleman, 
548. 
Mattagami Valley : Kerr, 1375. 
Michipicoten iron ranges : Coleman, 
542. 
Sudbury nickel field : Coleman, 539. 
Panama: Howe, 1244. 
Pennsylvania : Kemp, 1368 ; Kemp and 
Ross, 1373. 
Quebec, Brome Mountain : Dresser, 
743. 
Chibougarna mining region : Low, 
1624, 
Igneous and volcanic rocks — Continued. 
Quebec, eastern townships : Dresser, 
742. 
Mount Yamaska : Young, 2660. 
St. Francis Valley : Dresser, 365. 
Rhode Island : Emerson and Perry, 790. 
South Carolina : Graton, 1025. 
Pisgah quadrangle : Keith, 1353. 
Tennessee, Roan Mountain quadrangle: 
Keith, 1354. 
Texas, Chisos country : TJdden, 2409. 
Vermont : Richardson, 2037. 
Virginia : Watson, 2489. 
Washington, Snoqualmie quadrangle : 
Smith and Calkins, 2240. 
Wisconsin, Fox River Valley : Hobbs 
and Leith, 1193. 
north central: Weidman, 2511*. 
Wyoming, Bald Mountain and Dayton 
quadrangles : Darton, 645. 
Bighorn basin : Fisher, 873. 
Cloud Peak and Fort McKinney 
quadrangles : Darton, 646. 
Devils Tower quadrangle : Darton 
and O'Harra, 656. 
Yukon, White River region : McConnell, 
1648. 
Illinois. 
General. 
State geological survey : Salisbury, 
2113. 
necessity for : Bement, 200. 
work of: Bain, 10S. 
State geologist's report for 1906: Bain, 
110. 
Economic. 
Cannel coal in northern Illinois : Grout, 
1050. 
Coal: Bain, 100, 112; Parr, 1875, 1876. 
analyses : Parr, 1877. 
Coal seams, distribution : Bement, 201. 
Fire clays : Purdy and DeWolf, 1973. 
Glass sand : Burchard, 350. 
Lead and zinc deposits : Bain, 99 
vis, 663. 
Limestones : Van Horn, 2424. 
Mineral industry in 190G : Bain, 
Mineral production in 1905 : 
Horn, 2423. 
Oil fields: Bain, 102, 109; Blatchley, 
245. 
Saline-Gallatin coal field : DeWolf, 717. 
Silica deposits: Bain, 111. 
Dynamic and structural. 
Fracture systems: Hobbs, 1176. 
Stratigraphic. 
Calhoun County : Weller, 2522. 
Coal districts : White, 2545. 
Delafield drill core: Udden, 2410. 
East St. Louis area : Bowman and 
Reeds, 277 ; Fenneman, 800. 
Galena series : Sardeson, 2122. 
Geologic structure : Weller, 251S. 
Geological map : Irving 1277 ; Weller, 
2517, 2524. 
Gulf embayment area : Glenn, 969. 
Da- 
113. 
Van 
