DABTON.] 



NORTH AMERICAN GEOLOGY. 



251 



Colorado — Continued. 



1881. Examinations in Colorado and 



New Mexico, Stevenson. 



Coal with native silver in por- 

 phyry, Koeuig. 



Examination in Colorado and 

 New Mexico, Stevenson. 



Illustrations of the eartli's sur- 

 face, glaciers, Shaler and Davis. 



Fault in Yankee Hill, Leadville, 

 Shedd. 



Artesian wells, Berthoud. 



Canyons, their character and ori- 

 gin, Bross. 



Notes on Silver Cliff region, Wal- 

 lace, S. J. 



Whopper Lode, Gunnison Coun- 

 ty, Frazer, P. 



1882. So-called Leadville porphyry, 



Julien. 



Jura-Trias of southwestern Colo- 

 rado, Hills. 



Tertiary hasin of Colorado, Scud- 

 dcr. 



Cretaceous and Tertiary flora of 

 the West, Lesquereux. 



Tertiary history of Grand Canyon 

 district, Dutton, C. E. 



Peculiar features of Bassick 

 mines, Grahill. 



Tufa from Florissant, Wadsworth. 



Grand River coal, Theile. 



The Unaweep Canyon, Gannett. 



Facts in Montana, Idaho, Utah, 

 and Colorado, Newberry. 



Coal near Canyon City, Steven- 

 son. 



Section in shafts near Leadville, 

 Van Wagener. 



Certain Tertiary of the Great 

 Basin, Cope. 



Minerals from Table Mountain, 

 Golden, Cross and Hillebrand. 



Tertiary of central region, Cope. 



Report of United States Geolog- 

 ical Survey, Powell, J. W. 

 1883. Tertiary Mollusoa from Colorado, 

 Utah, and Wyoming, White, 

 C. A. 

 Report on work in Great Basin, 



Gilbert. 

 Cryolite minerals. Cross and Hil- 

 lebrand. 

 Ores of Rio Grande County, Hills. 

 Genesis of ore deposit, Keck. 



Colorado — Continued . 



1883. Mines andmills of Gilpin County, 

 Rogers, A. N. 

 Development of resources of Col- 

 orado, Smith, J. A. 

 San Juan region, Comstock. 

 Classifications of lake basins, 



Davis, W. M. 

 Jura-Trias of the western United 



States, Broadhead. 

 Coal measures in Gunnison 



County, Hallowell. 

 North Park, Broadhead. 

 Progress of geology, 1882, Hunt, 



T. S. 

 Silicified trunks, Warder. 

 Report on Cretaceous and Ter- 

 tiary, Ward, L. F. 

 Tertiary basin at Florissant, 



Soudder. 

 Cretaceous and Tertiary floras 



of the West, Lesquereux. 

 Leadville porphyry, Emmons, 



S. F. 

 Supposed Jura-Trias of the front 



ranges, Hallowell. 

 Fossils of the Laramie group. 



White, C. A. 

 Tufa from Florissant, Wads- 



worth . 

 Cretaceous fossils from Western 

 ern States, White, C. A. 

 1884. Sanadine, etc., in Nevadite of 

 Chalk Mountain, Cross. 

 Microscopic structure of building 



stones, Merrill, G. P. 

 Vertebrata of Tertiary of tlie 



West, Cope. 

 Ore deposits by replacement, 



Emmons, S.F. 

 Extinct glaciers of San Juan 



Mountains, Hills. 

 Azoic system and its subdivi- 

 sions, Whitney and Wads- 

 worth. 

 Artesian wells of Denver, Cross. 

 Triassic insects from the Rocky 



Mountains, Scudder. 

 Buffalo Peak, Emmons, S. F. 

 Building stones, Foster, J. W. 

 Hypersthene andesite and on tri- 



cliuic pyroxene. Cross. 

 The deposition of ores, Newberry. 

 Data concerning Denver wells, 

 Chisholm. 



