154 SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
north to south and 8 miles wide at the north, its broadest portion. 
The Bare Mountain hills are comparable to the most rugged portions 
of the Amargosa and Panamint ranges, the valleys being deep V- 
shaped troughs and many of the ridges between being knife-edges. 
Throughout the range the south sides of the gulches are somewhat 
less steep than the north sides, owing to the prevalent? dip to the 
northeast. The highest point of Bare Mountain, G,235 feet above sea 
level, is but 2 miles from the detrital pediment 3,000 feet below. The 
strongly folded Paleozoic rocks band the mountain with dark and 
light gray, yellow, white, and red. No water is known in these bare 
hills. 
GENERAL GEOLOGY. 
The formations exposed in Bare Mountain, from the oldest to the 
youngest, are as follows: Pogonip limestone, Eureka quartzite, peg- 
matite, monzonite porphyry, rhyolite, and basalt. 
PALEOZOIC SEDIMENTARY ROCKS. 
Bare Mountain is composed largely of Paleozoic sedimentary rocks 
so strongly folded and faulted that a satisfactory section could not be 
made in the time at the writer's disposal. The series presented from 
the top down is probably as follows : 
Probable section in Bare Mountain. 
Feet. 
Schist 12(H> 
Quartzite with pome schist and limestone 1,000 
Limestone containing near its top a considerable number of beds 
of schist 3, 000-4, 000 
Quartzite and schist : 100-200 
At the top of the series the schist, limestone, and quartzite re- 
peatedly replace one another within a thickness of 100 feet. These 
rocks, particularly at the north end, have been metamorphosed, the 
original limestone, shale, and sandstone being altered, respectively, to 
marble, schist, and quartzite. 
The limestone in the central part of the range is dark gray to blue- 
black in color, fine grained, compact, and rather crystalline. Anasto- 
mosing veinlets of calcite are characteristic. Much of the limestone 
is thinly laminated. At the north end of the mountain the limestone 
is changed to a white or light-colored marble, for the most part 
rather coarse grained. "Weathered surfaces are yellow or brownish 
in color. Muscovite films are developed on parting planes. The 
upper and lower quartzites consist of a white or light-gray metamor- 
phosed quartzose sandstone of fine or medium grain and conchoidal 
fracture. Cross-bedding is common and ripple marks are present in 
places. In transition to schist the quartzite becomes darker in color, 
finer in grain, and less pure, some muscovite being present. The 
