THE OVERLAND ROUTE OGDEN TO SAN FEANCISCO. 



161 



mation (Pliocene) near by. Valley Pass (elevation 6,072 feet) is the 



highest of the low divides Just mentioned. It is marl 



station and a water tank. 



mount 



oiling valley 



to the north, g^^assy on top but more or less thickly covered with 

 scrubby cedar trees on their lower slopes, are composed of Paleozoic 

 sandstone, shale, and limestone. 



Beyond Valley Pass the drainage channels lead off f o the northwest 

 -toward Thousand Springs Valley. The broad brush-covered plains 



ic railroad have little distinctive character ireoloiricallv 



or othenvise^ 



prcsum 



Humboldt fonn 



trenched by shallow gullies. Cuts along the railroad show stream- 

 deposited gravels. 



Within the 30 miles west of milepost 637 the train passes Icarus 

 (elevation 6,108 feet), Pequop (6,143 feet), Fenelon (6,153 feet), IIol- 



born (6,103 



An 



feet), Moor (6,160 feet), Cedar 



(5,909 feet), and KaAV (5,831 feet) — merely sidetracks, section houses, 

 or water tanks maintained chiefly for the use of the railroad. For 

 along distance the coarse white tuffaceous sandstones of the Hum- 



formation are the princiDal rocks 



Just 



beyond Pec^uop, however, between mileposts 630 "and 629, are con- 

 glomeratic strata interlayered with evenly bedded clays or clay shales 

 of a distinct hght-greenish color, which are believed to be of older 

 Tertiary age (Eocene, Green River formation). Faults displacing the 

 clays and conglomerate are visible in the railroad cuts but possibly 

 would not ordinarilv be noticed from the train. 



Between Anthony and Moor an extensive view may be had to the 

 south and southeast over the north end of Independence Valley, the 

 larger part of which hes beyond the range of vision. This valley con- 

 stitutes another of the distinct drainage units of which the Great 

 Basin is composed. The railroad continues to 

 skirtinsr the slooes at the north ed^-e of the vallev. 



ascend gradually, 

 For several miles 

 ad passes throucrh 



& 



ervt>d 



am 



a 



that was used by the Pony Express and 

 Overland Stage in pioneer days. Gold 

 was discovered here in 1861, and between 

 1872 and 1882 the district supported a 

 population of about 3,000. The total 

 production amounted to several millon 

 dollars, but at present comparatively 

 little work is in progress. Gold ores and 

 eilver-lead ores occur here in sedimentary 

 rocks, principally in quartzite. 



In the Gosiute mining district, which 

 lies 20 miles south of Cherry Creek, in the 



Egan Kange, silver-lead ores have re- 

 cently been mined from veins occurring 

 in limestone. The Spruce Mountain, 

 Hunter, Schellbourne, Duck Creek, and 

 Ward mining districts, in which work 

 has been more- or less actii-e during re- 

 cent years, are also tributary to the Xevada 



Railroad 



92213 ° 



Bull. 612—15 



11 



