158 REPORT UNITED STATES GEOLOGICAL SURVEY. 



Micaceous. — In some veins traversing the granites of the "Wind 



River Range on the upper drainage of the Little Sandy. 

 Sjwcular. — At the same locality. Occurring - mostly in small, crys- 

 talline masses, rarely crystallized. 

 LlMONlTE. — In Cretaceous shales on the Little Popo-Agie. Throughout 

 the ferruginous strata of the upper Cretaceous beds, in small deposits. 

 Magnetite. — Minute crystals in some of the metamorphic rocks. 

 Malachite. — In chalcopyrite, the result of decomposition from ore of 



the Seminole Mines. 

 Muscovite. — Good crystals in granite east of the South Pass. Through- 

 out the Prozoic granites, sometimes in sheets of several inches. 

 Obsidian. — Scattering, in fragments, transported from other localities 



by Indians. 

 Oligoclase. — In the granites of the Wind River Range. Rarely occur- 

 ring crystallized. 

 Olivine. — In some of the basalts near Essex Mountain. 

 Orthoclase. — Red and flesh-colored in the Prozoic granites. Xo crys- 

 tals were found. 

 Petroleum. — In the "tar springs" of the Little Popo-Agie and near 



Camp Brown. 

 Phlogopite. — In the granites of the Wind River Range, as a constitu- 

 ent mineral. 

 Pyrite. — Throughout the Sweetwater Mines. Mostly decomposed. 

 Crystalbzes in cubes. In the Seminole Mines. Concretionary in the 

 shales of the younger sedimentary groups. 

 Quartz. — Crystallized hi druses of the Carboniferous limestones. Mass- 

 ive; white, yellow, gray, and innk in the Prozoic and metamorphic 

 granites. 

 Agate. — In the lower Green River and upper Wasatch beds. Forms 



geodes in Carboniferous limestones. 

 Basanite. — In drift originating from Tertiary strata. 

 Chalcedony. — Very abundant, in drift and in the upper strata of the 

 Wasatch. Found in large quantities in the Carboniferous lime- 

 Stones and Pliocene marls north and northwest of Granite Hills. 

 Flint. — Occurs together with chalcedony. 

 Jasper. — Found at the same localities. 



Moss-agate. — Very fine north of the Sweetwater, at Agate Lakes. 

 Poorer specimens from the upper Wasatch beds. 

 Siderite. — Massive in the metalliferous schists south of Atlantic City. 

 Thernandite. — In the alkaline lake deposits as efflorescence. Some- 

 times crystallized. 

 Tourmaline. — Good crystals, with double terminations, west of South 



Pass in granites. 

 Trona. — Ln alkaline deposits as efflorescence. 



Wavellite. — Radiated in shales near Separation. Light-green color. 

 Zircon. — In some of the hornblendic and micaceous schists near Camp 

 Stambauffh. 



