PEALE. ] 



GEOLOGY — CATALOGUE OF MINERALS. 



179 



rocks in the volcanic breccia, near station 31, at the head of west fork 



of Ohio Creek. 

 Calcite. In the Cretaceous rocks on Grand Eiver and on the Gunnison 



Eiver. • 



Coal. Bituminous lignite on south fork of Anthracite Creek. Anthracite f 



on Anthracite Creek. A poor quality of lignite is found also in the 



bluffs at the mouth of the Gunnison. 

 Feldspar. Undetermined varieties in the schists at the head of Eagle 



Eiver and in the Grand Canon of the Gunnison. Sanidine in the 



rhyolites and obsidian on the Gunnison Eiver. Trachytes of Elk 



Mountains. 

 Gold. Said to occur along the upper part of the north fork of the Gun- 

 nison and head of Eagle Eiver. 

 Gypsum. In the gypsiferous sandstones on Eagle Eiver and on Grand 



Eiver and Eoaring Fork. In the Cretaceous strata of Grand Eiver 



and the Gunnison. 

 Chalcedony. Blue variety, lining cavities in the rhyolites on Gunnison 



Eiver, above the Grand Canon. White, in valley of Gunnison, west 



of mesa, above the Grand. 

 Hyalite. In the basalt on station 48, near station 73, on Gunnison Eiver. 

 Hornblende. (See Amphibole.) 

 Jasper. Eed in color, in chips on the plateaus, between the Grand and 



Gunnison Eivers. In nodular limestone in the bluffs on Gunnison 



Eiver near station No. 60, also near station 73. 

 Limonite. Near the head of the south fork of Anthracite Creek. 

 Mica. Undetermined variety, probably Muscovite, in schists of Eagle 



Eiver and Gunnison Eiver. Brown variety in rhyolites in Gunnison 



Eiver. 

 Obsidian. Beneath the trachyte on Gunnison Eiver, above the Grand 



Cation. It is both porphyritic and spherulitic. 

 Pyrite. Octahedral crystals near station 32, Anthracite Creek. Coat- 

 ing surfaces of basalt, near station No. 48. 

 Quartz. In the schists of Eagle Eiver and the Gunnison ; crystals in the 



Cretaceous rocks near station No. 32, at the head of Anthracite Creek. 

 Sanidine. In the trachytes of station 32, station 30, station 34, &c; also, 



in the obsidian and rhyolite on Gunnison Eiver, above the Grand 



Canon. 

 Selenite. In the gypsum beds of Eagle and Grand Eivers. In the Creta- 

 ceous shales at various points along the Gunnison Eiver. 

 Tremolite. In radiating crystals in the porphyritic trachyte on station 



No. 38. 

 Lignite. (See Coal.) 



CATALOGUE OP EOCKS COLLECTED IX 1873 BY A. C PEALE, MIDDLE DIVISION 

 UNITED STATES GEOLOGICAL SURVEY. 



No. 



Name, &c. 



Locality. 



Porphyry 



do 



do 



Gray siliceous sandstone (Cretaceous) 

 Mottled limestone (Cretaceous?) 



Selenite. 

 Gypsum 



Greenish sandstone (Cretaceous ?) 



Gray sandstone, Cretaceous 



Greenish sandstone 



Mines on Mount Lincoln. 



Do. 



Do. 

 Station No. 6, on Eagle Eiver. 

 Below station No. 7, on Eagle Eiver. 

 South of Eagle Eiver, near station No. C>. 

 Near the junction of Eagle and Grand Eivers. 



Do. 

 North side of Eagle Eiver, near its mouth. 

 Station No. 26, west of Eock Creek. 

 Anthracite Creek, near Mount Marcellina. 



Do. 



