GOSI-UTE RANGE. 503 



Carboniferous age. The granite formations of the range occupy a very 

 small portion of the area, and were observed with certainty in but two 

 localities, one a mere outcrop in Toano Pass, and the other a much larger 

 body in Middle Pass. The Middle Pass granite is an irregular-shaped 

 mass, and, like the granite from the Ombe Mountains, extends across the 

 range from valley to valley. It lies depressed between two large quartzite 

 masses, portions of the great quartzite formation of the range, referred to 

 the Weber beds, which, within short distances, tower above the summit 

 of the pass, both to the north and south, at least 1,500 or 2,000 feet. On 

 the west side, the granite rises only from 500 to 600 feet above the Gosi-Ute 

 Valley, has a smooth, rounded summit, and falls toward Tecoma Valley, 

 1,500 feet below, in long, gentle slopes. This granite is coarse-grained, with 

 a loose friable texture and a light-gray color. The constituent minerals 

 show no order in their arrangement, and the rock appears to possess a 

 normal granitic structure. All the ridges, outlying masses, and drainage- 

 basins have gently curved and rounded outlines, sub-aerial action develop- 

 ing scarcely any sharp lines. The outcrop of granite mentioned as occur- 

 ring in Toano Pass is found in the ravines north of the railroad, on the 

 eastern slope, about two or three miles northeast from the town of Toano. 

 So far as observed, it closely resembles the Middle Pass rock in physical 

 habit and mode of disintegration, and is chiefly interesting from the indica ■ 

 tion that it offers of a continuation northward of the same body of granite. 

 Between Toano and Middle Pass, the range is formed of the Weber 

 Quartzite and the overlying Upper Coal-Measure limestone. Directly north 

 of Middle Pass, the highest hills are of quartzite, but beyond, the summits 

 are all capped by the limestone. South of the Toano Pass, the high group of 

 hills forming the east half of the range are also formed of heavy beds of 

 bluish-gray limestone, dipping 30" to the east, and striking about north 

 and south true. Near the west base of this series is a quartzite band, about 

 250 feet in thickness, which conformably underlies the main body of lime- 

 stones. Underneath this again is a further development of limestone, whose 

 thickness cannot be determined owing to the overlying Quaternary deposits. 

 In the canon of Owl Valley, the rocks are mostly quartzite, apparently dip- 

 ping east, and underlying the limestone body. 



