270 



GEOLOGICAL SURVEY OF THE TEREITOEIES. 



mines at the bead of Rock Creek in the Elk Mountains ; at the Home 



stake mine, near Tennessee Pass. 

 Sphalerite,* in large quantities in the Mosquito gold mines; also in 



some of the silver mines, carrying from $10 to $150 per ton in silver: 



(some specimens contain cadmium : it is mostly massive and highly 



ferruginous ;) at the Homestake mine, near Tennessee Pass. 

 Stephanite,* (crystallized and massive,) in the Moose and other mines 



in the Mount Bross mining district. 

 Sulphur, in the springs in South Park, and also on Frying-Pan Creek. 

 Talc, on Sopris Peak. 



Tennantite,* (crystallized,) in Buckskin mining district. 

 Tetrahedritre,* in complicated crystals and massive; It is the principal 



silver 'ore of the Buckskin mines, and assays from $50 to $300 per- 



ton. 

 Tourmaline, on Italia Peak ; no fine doubly terminated crystals in the 



schists near Montgomery. 

 Tufa, (calcareous,) on Eoaring Fork ; on the North Fork of Frying-Pan 



Creek. 

 Vesuvianite, in fine crystals on Italia Peak. 

 Wollastonite,* in veins traversing the lower limestones in the Mount 



Bross mining district. 

 Zinkenite,* in minute crystals in the Sweet Home mine. 



No. 2.--CATAL0GUE OF EOCKS. 



Catalogue of rocks collected by A. C. Feale and W. B. Taggart. 



No. 



Name. 



Locality. 



9 



10 

 11 

 12 

 13 

 14 

 15 

 16 



17,18 



19,20 

 21 

 22 



23,24 

 25 

 26 

 27 

 28 

 29 

 30 



31-33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 



Tellow sandstone, (Cretaceous ?) 



White sandstone, (Cretaceous ?) 



Purplisli sandstone, (Cretaceous?) 



Arenaceous limestone, (Jurassic ?) 



Brick-red limestone, (Jurassic ?) 



Gray limestone, fossiliferous, (Cretaceous No. 3) 



Eed feldspathic granite 



Red sandstone, (Triassic ?) 



Gneiss 



Gypsum 



Pink calcareous sandstone shale, (Jurassic) . . 



Pink mottled limestone, (Jurassic) 



Gray sandstone, (Tertiary) 



Pink trachyte ". .' 



Gray trachyte 



Ferrugineous sandstone 



Gypsiferoiis sandstone, (Jurassic^ 



Gypsum, (Jurassic ?) 



Pink limestone 



Dark-green sandstone, (Potsdam 1) 



Red sandstone, (Potsdam ?) 



Pinkish-gray limestone, (Silurian ?) 



Granite 



Gneiss 



Granite 



Trachyte 



Argillaceous shale, (Tertiai-y) 



Coarse sandstone, (Tertiary) 



Conglomeritic sandstone, (Tertiary) 



Shaly sandstone 



Brown sandsl one, (Silurian ?) 



Green sandstone, (Silurian ?) 



Tellow sandstone, (Silurian ?) 



Red limestone, (Silurian ?) 



Red limestone, green spotted, (Silurian ■?) 



Mottled conglomeritic limestone, (Silurian ?) . . 



Red limestone, (Silurian ?) ■. 



Pink shaly limestone, (Silurian ?) 



South side of South Platte River below the 

 caiion. 



Do. 



Do. 



Do. 



Do. 

 Willow Creek. 



Canon at head of Bear Creek. 

 Pleasant Park, on Bear (3reek. 

 Hills west of Pleasant Park. 

 Pleasant Park. 



Do. 



Do. 

 Mesa east side of Plum Creek. 

 Summit of mesa east side of Plum Creek. 



Do. 

 Monument Park. 

 Near the Garden of the Gods, 



Do. 



Do. 

 Glen Eyrie. 



Do. 



Do. 

 Summit of Pike's Peak., 

 Upper Calion of South Platte River. 



Do. 

 Beaver Creek Valley. 

 Beaver Creek VaUey, near Plorissant. 



Do. 

 Petrified Stumps, near Florissant. 



Do. 

 East side of Trout Creek, below Bergen Park. 



Do. 



Do. 



Do. 



Do. 

 West side of Trout Creek, below Bergen Park. 



Do. 



Do. 



