RANGES NORTH OF PAHUTE MESA. 89 
A prospect is located in the Cambrian limestone area 2 miles oast of 
Stonewall Spring. .V thin vein of quartz cuts a granite-porphyry 
dike, which here intrudes limestone. The quartz is slightly limonite 
stained and said to carry from $2 to $56 in gold per ton. 
RANGES NORTH OF PAHUTE MESA. 
To the north of Pahute Mesa, which occupies the central portion of 
the area surveyed, lie the Cactus, Kawich, Reveille, and Belted 
ranges. These, with the exception of the Cactus Range, trend north 
and south. They have as their predominant formation a rhyolite of 
early Miocene age. 
CACTUS RANGE. 
TOPOGRAPHY AND GEOGRAPHY. 
The Cactus Range lies between Stonewall and Cactus flats. To the 
north its outlying hills are separated from the Monitor Hills by Ral- 
ston Valley; its low southern portion is buried beneath lava flows of 
Pahute Mesa. The range as defined is 22 miles long and has a crest 
line coursing northwest. The low central part is almost cut in two 
by gently sloping valleys filled with alluvial material. To the north 
of this median line the range culminates in Cactus Peak, a symmet- 
rical cone 7,550 feet high and a landmark visible for many miles. 
The highest peak of the range south of the center line is a black mas- 
sive mountain 7,600 feet high. 
Pihon and juniper grow sparsely on the higher parts of the range 
south of the median line, and the tree yucca abounds on the lower 
hills and upper alluvial slopes. Good grazing is found on the allu- 
ial slopes next to the mountains and in some of the valleys. Cactus 
Spring lias a daily flow T of about 500 gallons of clear cold water. The 
water of Alkali Spring is cool, but slightly saline. Several other 
;mall water holes are reported to the west and north of Alkali Spring. 
Antelope Spring Aoavs from 300 to 400 gallons of cool palatable 
water daily, and two smaller evanescent springs are situated in 
gulches to the south within one-half mile of Antelope Spring. 
GENERAL GEOLOGY. 
The succession of formations exposed in this range, from the base 
ip, is as follows: Pogonip limestone. Eureka quartzite, Weber con- 
lomerate, granite, diorite porphyry, hornblende-biotite latite, earlier 
rhyolite, biotite andesite, augite andesite, later tuffs (?), later rhyo- 
ite ( ?), and basalt. 
SEDIMENTARY ROCKS. 
Pogonip limestone. — A small exposure of dark-gray fine-grained 
imestone, surrounded by alluvial deposits, occurs in the broad valley 
I miles south of the Goldfield-Cactus Spring road. This limestone is 
