14 BORAX OF DEATH VALLEY AND MOHAVE DESERT. [bull. 200. 
the southern end of the Panamint Range. Structure lines following 
this direction are common in the Death Valley region, and they will be 
discussed more fully in connection with the Furnace Creek deposits of 
the northern end of the valley. 
The rocks composing the southern end of Funeral Mountain are well 
exposed at Saratoga Spring/' They strike north and south, and dip to 
the east about 50°. They are limestone, shale, and quartzite, presum- 
ably of Cambrian or pre-Cambrian age. Several hours were spent in 
searching for fossils in these beds, but none were found. 
The road to Resting Spring runs diagonally across this mountain to 
the northeast, following a fault that has sheared across the ends of the 
tilted strata forming the end of the mountain. North of the fault line 
similar rocks strike N. 60° E., and stand nearly vertical. Funeral 
Mountain was examined carefully through a strong glass to see if any 
Tertiary rocks exist in the southern part of the range, but nothing was 
seen that suggested their presence. Strata resembling that exposed at 
Saratoga Spring could be traced northward for several miles into he 
high summits, where they appeared to be broken and replaced by 
intrusive masses that form the bulk of the mountain. 
The summit of the pass through which this road runs is at an alti- 
tude of about 1,700 feet above Saratoga Spring, which is probably not 
far from sea level. The pass is deeply covered with gravel, which 
extends down the eastern slope, completely concealing the bedded 
rock on this side of the mountain. 
Amavgosa Valley at Resting Spring. — Lake sediments fill the Amar- 
gosa River Valley in the vicinity of Resting Spring. These beds are 
composed of sand and clay, but there are no beds of volcanic tuff or 
sheets of lava such as are found in many areas of similar beds. In this 
respect the} T resemble the lake beds in the vicinity of Victor, and it 
seems possible that they are of the same age. These beds are approxi- 
mately horizontal, and in this respect they also resemble the Victor 
.sediments. 
The lake in which these beds were deposited was limited on the 
south by a rock barrier across the valley 3 or 4 miles south of the 
old borax works. The northern extremity was not seen, but lake sed- 
iments are reported to extend in that direction for a distance of only 
6 or 8 miles. Toward the east the water reached beyond Resting 
Spring, and a narrow arm of the lake existed in the valley at the base 
of Kingston Mountain. 
Although these beds are not folded, they bear evidence of consid- 
erable crustal movement since their deposition. The eastern margin 
that rests against the foot of the Kingston Range is 800 feet higher 
than the uppermost beds of the same series at the foot of Funeral 
Mountain. This indicates a depression toward the west in the direc- 
tion of Death Valley. There seems to have been a local subsidence in 
"See section by Gilbert in U.S. Geog.Surv. W.One Hundredth Mer., Vol. Ill, 1875, pp. 34, 170. 
