INDEX. 
223 
Colorado — Continued. 
Economic — Continued. 
Danforth Hills and Grand Hogback 
coal fields : Gale, 924. 
Durango district, coal : Taff, 2336. 
Durango-Gallup field, coal : Shaler, 
2176. 
clay deposits : Shaler and Gardner, 
2177. 
Georgetown quadrangle: Ball, 118. 
Gilpin County, pitchblende: Tovote, 
2384. 
Gunnison gold belt: Lakes. 1472. 
Gypsum of Uncompahgre region : Sie- 
benthal, 2207. 
Ilahns Peak gold field : Gale, 922. 
Idaho Springs mining district: Spurr 
and Garrey, 2275 
Iron ores : Leith, 1552. 
Lake Fork extension of Silverton min- 
ing area : Woolsey, 2635. 
Leadville: Barker, 143. 
Downtown district: Emmons and 
Irving. 803. 
Yak mine: Armington and Stotes- 
bury, 55. 
Lodes in Tertiary eruptives : Rickard, 
2055. 
Maple Leaf mine : Lakes, 147;"). 
Nepesta quadrangle: Fisher, 869. 
Oil fields : Lakes, 1478. 
Ordovician rocks: Darton, 644. 
Ouray quadrangle: Cross et ah, 607. 
Pre-Cambrian, Georgetown quadrangle: 
Ball, 118. 
Rio Blanco County, carnotite : Gale. 
923. 
Routl County: Fenneman and Gale, 
862. 
coals: Headden, 117; Lakes. 1470. 
San Juan Mountains: Howe and Cross. 
11' 17. 
Cranium and vanadium belts : Fleck 
and Haldane, 878. 
White River region, natural gas: 
Lakes, 1476. 
Physiographic. 
Chalk Bluffs and Pawnee Buttes, topo 
-graphic development of: Hen- 
derson, 1 L28. 
Mesa de Maya, physiographic signifi- 
cance of : Keyes. 1389. 
Physiographic features : Koenigsberger, 
1 122. 
Stratigraphie. 
Arkansas Valley: Darton, 648. 
Clear Creek, lower: Dnderhill, 2414. 
Cripple Creek district : Lindgren and 
Ransome, 1605. 
Denver basin : Lakes, 1 460. 
Florissant Tertiary lake basin: Hen- 
derson. 1 I 27. 
Georgetown quadrangle, pre-Cambrian 
rocks: Ball, 118. 
Colorado — Continued. 
Stratigraphic Continued. 
Glacial phenomena in San Juan Moun- 
tains: Howe, 1243; Howe and 
Cross. 1247. 
Gleneyrie formation : Finlay, 868. 
Ilahns Peak region : Gale, 022. 
Nepesta quadrangle: Fisher, 869. 
Ordovician rocks: Darton, 644. 
Ouray quadrangle: Cross et <tl., 607. 
Pre-Cambrian rocks of Georgetown 
quadrangle : Ball, 118. 
Routt County : Fenneman and Gale, 
862. 
Sangre de Cristo Range, glaciation in : 
Siebenthal, 2210. 
San Juan Mountains, glacial phe- 
nomena : Howe and Cross, 1247. 
Western : Cross, 604. 
Paleontology. 
Ant from Florissant : Cockerell, 516. 
Cicada from Florissant : Cockerell. r>22. 
Florissant basin, fauna and flora : 
Brues, .•'.••'.7 : Cockerell, 516 524; 
Wheeler, 25:;:;. 
fossil localities: Cockerell. 527. 
Flower from Miocene of Florissant : 
Hollick, 1211. 
Ilymenoptera from Florissant : Brues, 
337; Cockerell. 521. 
Insecta from Florissant : Cockerell, 
521, 526, 528-535. 
Mollusca from Florissant : Cockerell, 
523, 536. 
Mosses : Britton and Hollick, 304. 
Planorbis from Florissant : Cockerell, 
519. 
Plants from Florissant : Cockerell, 520. 
Sauropodan gastroliths : Cannon, 420. 
Saw-flies from Florissant : Cockerell, 
524. 
Vertebrate fossils from near Denver : 
Cannon, 420. 
Water-bug from Florissant : Cockerell, 
519. 
Zonitoid shell from Florissant : Cock- 
erell. 536. 
Petrology. 
Clear Creek region: Underbill, 2411. 
Corundum and dumortierite in peg- 
matite: Finlay, 867. 
Cripple Creek district: Graton, 1026; 
Lindgren and Ransome. 1604. 
Georgetown quadrangle : Ball. 118. 
Prowersose from Two Buttes: Cross, 
603. 
Mineralogy. 
Cripple Creek district, minerals: Lind- 
gren and Ransome. 1604. 
Molybdite : Schaller, 2137. 
Phosphorescent calcites : Headden. 
1116. 
Pyrite: Kraus and Scott. 1428. 
