232 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Gastropoda. See also Mollusca. 
Arizona : Cockerell, 515. 
Busycon (Fulgur) from Oligocene of 
Florida : Aldrich, 24. 
California, southern, Tertiary : Arnold. 
62. 
Colorado, Florissant : Cockerell, 517. 
Devonian : Clarke, 497. 
Eocene from Alabama : Aldrich, 25. 
Hackberry group, Iowa : Webster, 
2496, 2497. 
New Mexico : Cockerell, 515. 
Ordovician, retaining color markings : 
Raymond. 1988. 
Orthogenetic variation : Grabau, 996. 
Planorbis from Florissant : Cockerell, 
517. 
Pliocene of Florida : Pilsbry, 1930. 
Psilocochlis : Dall. 627. 
Volutidse : Dall, 629, 630. 
Westerna, from Hackberry group of 
Iowa : Webster, 2496. 
Zonitoid shell from Florissant : Cock- 
erell, 536. 
Gems. See also Precious stones. 
California : Kunz, 1437. 
South Carolina : Sloan, 2218. 
Virginia : Watson, 2493. 
Genesis of ores. See Ore deposits, origin. 
Geologic formations described. See list 
p. 284. 
Tables. See Stratigraphic, Tables of 
formations. 
Geologic history. See also Paleoclimatology. 
General. 
Geologic research in continental his- 
tory : Willis, 2590. 
Paleozoic. 
Carboniferous, Appalachian basin : 
Stevenson, 2295. 
Chazy time : Raymond, 1987. 
St. Peter time : Berkey, 205. 
Post-Paleozoic. 
Great Lakes, history of : Goldthwait, 
975 ; Taylor, 2363. 
Mid-Cretaceous geography : Berry, 211. 
Regional. 
Appalachian basin, Carboniferous : 
Stevenson, 2295. 
Alaska : Brooks, 313 : Paige and 
Knopf, 1862; Spencer, 2261. 
Turnagain Arm region : Moffit, 1762. 
Arizona, Colorado River region : Lee, 
1541, 1548. 
Tertiary peneplain : Robinson, 2078. 
Arkansas : Purdue, 1971 ; Veatch, 2436. 
British Columbia, Cascade Mountains : 
Daly, 632. 
California : Comstock, 563 ; Diller, 721. 
Ancient river channels : Kimble, 
1395. 
Great Basin : Ball, 120. 
Owens Valley : Lee, 1540. 
Santa Clara Valley: Crandall, 590. 
Santa Maria district : Arnold and 
Anderson, 68. 
Canada, northeastern : Low, 1623. 
Geologic history— Continued. 
Regional — Continued. 
Colorado : Darton, 648 ; Fisher, 869. 
Florissant basin : Henderson, 1127. 
Ouray quadrangle : Cross et al., 607. 
Colorado Canyon : Davis, 667. 
Connecticut: Rice, 2030. 
Delaware : Miller, 1749. 
Great Basin : Ball, 120. 
Great Lakes : Goldthwait, 975 ; Taylor, 
2363. 
Indiana : Blatchley, 244. 
Indian Territory : Taff, 2332. 
Iowa, channel of Mississippi River : 
Calvin, 389. 
Lancaster quadrangle : Grant and 
Burchard, 1021. 
Kansas, Joplin district : Smith and 
Siebenthal, 2251. 
Louisiana : Veatch, 2436, 2437. 
Maine, Penobscot Bay quadrangle : 
Smith et al,, 2241. 
Maryland : Miller, 1749 ; Shattuck, 
2184, 2185. 
Calvert County : Shattuck, 2187, 
2188. 
Coastal plain : Davis, 677. 
Patuxent quadrangle : Shattuck et 
ah, 2193. 
St. Marys County : Shattuck, 2190, 
2191. 
Massachusetts : Mansfield, 1674. 
Mount Greylock : Dale, 620. 
Mississippi River channel : Calvin, 389. 
Mississippi Valley, upper : Bain, 99. 
Missouri : Shepard, 2194. 
Granby area : Buckley and Buehler, 
346. 
Joplin district : Smith and Sieben- 
thal, 2251. 
Montana, Marysville district : Barrell, 
149. 
Nevada, Great Basin : Ball, 120. 
New Mexico : Keyes, 1378. 
Rio Grande Valley : Lee, 1545. 
Tertiary peneplain : Robinson, 2078. 
New York, Adirondacks : Cushing, 614. 
Catskill Mountains: Heilprin, 1126. 
Long Island : Veatch, 2430, 2434. 
Schoharie Valley : Grabau, 991. 
western, in Silurian time : Hart- 
nagel, 1085. 
North America : Shimer, 2205. 
North Carolina, Nantahala quadrangle : 
Keith, 1352. 
Pisgah quadrangle : Keith, 1353. 
Roan Mountain quadrangle : Keith, 
1354. 
Nova Scotia : DeWolfe, 718. 
Pennsylvania, Amity quadrangle : 
Clapp, 475. 
Rogersville quadrangle : Clapp, 476. 
South Carolina, Pisgah quadrangle : 
Keith, 1353. 
Pleistocene : Pugh, 1963. 
Utah: Richardson, 2041. 
Uinta Range : Weeks, 2506. 
