WEEKS.] 
PETROLOGY, AND MINERALOGY FOR 1892-1900. 
53 
Colorado— Continued. 
Mines of Rosita and Silver Cliff, Colo., Em- 
mons, 1706, 1708. 
Mining industry of Cripple Creek, Colo., Pen- 
rose, 4347. 
Mining industries of Telluride quadrangle, 
Purington, 4511, 4512. 
Mining sketches, Lakes, 3321. 
Mode of occurrence of gold at Cripple Creek, 
Pearce,4271. 
Natural gas at Manitou, Colo., Strieby, 5278. 
Natural gas, Lakes, 3347. 
New Cretaceous genus of Clypeastridae, Cra- 
gin, 1120. 
New mineral from Cripple Creek, Knight, 
3201. 
Newcastle mines, Hosea, 2759. 
Newman Hill, ore deposits of, Farish, 1791. 
Nickel, occurrence, distribution, and genesis 
of,Argall, 119. 
Notes on a great silver camp, Carlyle, 750. 
[Occurrence of nickel], Charleton,874. 
Occurrence of a silver and gold mineral con- 
taining tellurium, Pearce, 4274. 
On pearceite, Penfield, 4311. 
On the nature of igneous intrusions, Russell, 
4706. 
Ore deposits of Cripple Creek, Penrose, 4345. 
Ore occurrence in Red Mountain, Lakes, 
3338. 
Ore shoots of Cripple Creek, Lakes, 3322. 
Ore shoots of Cripple Creek, Skewes, 4992. 
Ores of Vulcan mine, Lakes, 3341. 
Ozokerite, Ohly, 4133. 
Past eruptions in the Rocky Mountains, Hills, 
2590. 
Peculiar formation in San Juan region, Lakes, 
3319. 
Peculiar form of Talus, Spencer, 5120. 
Peculiar geologic formation, Patton,4258. 
Peculiar ore body, Lakes, 3340. 
Physiographic types, Gannett, L942. 
Pikes Peak folio, Cross, 1187. 
Pikes Peak, Colorado, Lakes, 3312. 
Pine Creek district, Colorado, McCarn,3832. 
Placer fields of Colorado and Wyoming, Snow, 
5107. 
Post-Laramie beds of Middle Park, Cross, 
1181. 
[Post-Laramie beds of Middle Park], Hills, 
2592. 
Post-Laramie deposits of Colorado, Cross, 1179. 
Polybasite and tennantite, Penfield and 
Pierce, 4298. 
Prospecting refineries, Lakes, 3335. 
Ptilolite, new occurrence of, Cross and Eakins, 
1180. 
Public lands and their water supply, Newell, 
4085. 
Pueblo folio, Gilbert, 2005. 
Report of Bureau of Mines, Lee, 3437. 
Restoration of Elotherium, Marsh, 3684. 
Rico mining district, Lakes, 3320. 
River terraces in southwestern Colorado, 
Spencer, 5119. 
- Rocky Mountains of Colorado, Emmons, 1692. 
Rosita and Silver Cliff, Lakes, 3333. 
Colorado— Continued. 
Sandstone dikes of Ute Pass, Colorado, Crosby, 
1163a. 
Sandstone dikes of Ute Pass, Crosby, 1163. 
San Juan region, Lakes, 3315. 
San Miguel formation, Cross, 1194. 
Seaton mine, Underhill, 5545. 
• Series of peculiar schists, Cross, 1184. 
Silurian vertebrate life at Canyon City, Wal- 
cott, 5788. 
Silver Cliff district, Lakes, 3331. 
Silver Pick mine, Spaulding, 5111. 
Smuggler Union mines, Porter, 4418, 4419. 
Stratigraphy of Platte series, Cragin, 1125. 
Summit district gold regions, Lakes, 3314. 
Telluride folio, Cross, 1201. 
Telluride ore, Pearce, 4282. 
Telluride ores, Lakes, 3334. 
Telluride quadrangle, economic geology of, 
Purington , 4513. 
Telluride veins in La Plata Mountains, Aus- 
tin, 136. 
Tellurides from Colorado, Palache, 4245. 
Tellurium and Telluride ores, Lakes, 3339. 
Tenmile folio, Emmons, 1712. 
Tepee buttes, Gilbert and Gulliver, 1999. 
Tertiary Tipulidae, Scudder, 4891. 
The Capricorns, Cragin, 1131. 
The contact deposits of the La Plata Moun- 
tains, Lakes, 3371. 
The Cripple Creek gold field, Rickard, 4600. 
The debris-covered mesas of Boulder, Colo., 
Lee, 3445. 
The great London fault of the Mosquito 
range and the London mine, Lakes, 3369. 
The La Plata Mountains of Colorado, Lakes, 
3359. 
The onyx marbles, Merrill, G. P., 3944. 
The Smuggler-Union mines, Porter, 4417,4418. 
Thomsonite, Mesolite, and Chabazite from 
Golden, Patton, 4261. 
To trace an invisible dike, Stone, 5253. 
Tourmaline-schists, Patton, 4260. 
Turkey Creek mining district, Stone, 5252. 
Twin Lakes region, Colorado, Guentherodt, 
2203. 
Underground waters of the Arkansas Valley, 
Gilbert, 2000. 
Undeveloped resources of Colorado, Lakes, 
3329. 
Upper Cretaceous section, Spencer, 5116. 
Uraninite in Colorado, Pearce, 4273. 
Vein formation of Gilpin County, Rickard, 
4590. 
Vein intersections, Underhill, 5544. 
Vein structure in Enterprise mine, Rickard, 
4604. 
Vein walls, Warren, 5867. 
Vertebrate fauna in Silurian strata, Walcott, 
5780. 
Vertebrate fossils, Marsh, 3702. 
Victor, Colo., Lakes, 3316. 
Volcanic craters, Lakes, 3332. 
Volcanic dust in Utah and Colorado, Mont- 
gomery, 4025. 
Volcanic rock of Alum Hill, Andrews, 115. 
Walsenburg f ^lio, Hills, 2599. 
