REVEILLE RANGE, SEDIMENTAEY ROCKS. 115 
The Reveille is a narrow, rugged mountain range with a crest 
line of rather sharp peaks culminating near its south end in Reveille 
Peak, 8,900 feet high. The eastern slope, descending to the deep 
Railroad Valley, is the more precipitous. Tin . est line against 
which deep, narrow canyons head, is in places a >dge flanked 
on either side by cliffs hundreds of feet high. The more profound 
of thee canyons are 1,000 feet deep and are notable tor the forests 
of rhyolite spires which cover their precipitous sides. The rhyolite 
is everywhere characterized by a rugged topography. Fang Ridge 
is a prominent part of the range from which protrude fantastic 
domes and spires strikingly like the fangs and molar teeth of an 
ancient monster. The " teeth " are from 200 to 300 feet high. The 
smooth slopes and shallow, straight-walled canyons of the flanking 
masses of basalt, which in some cases almost bridge over the range. 
are in strong contrast with the intensely dissected rhyolite. 
The crest line of the range is covered by a fair growth of pinon and 
juniper, which at the northern border of the area surveyed on the 
west side descend to the alluvial slopes. Several large springs are 
located at Old Reveille, 1| miles north of the boundary of this area, 
and a pipe line extends from these to New Reveille. 
GENERAL GEOLOGY. 
The formations of the Reveille Range include, in ascending order, 
the Weber conglomerate, Pennsylvanian limestone, rhyolite, and 
basalt. 
SEDIMENTARY ROCKS. 
Weber conglomerate. — North of the area mapped from Old Reveille 
to the summit, between that town and New Reveille, the predominant 
formation is a white massive quartzite. of which from 1,000 to 2,000 
feet is exposed. If, as is apparently the case, this quartzite underlies 
the Pennsylvanian limestone it is the Weber conglomerate, although 
lithologically it is more nearly related to the Prospect Mountain 
(Cambrian) or Eureka (Silurian) quartzite. 
Pennsylvanian limestone. — Overlying this quartzite. apparently 
J conformably on the west side of the range near Reveille, is 2,000 feet 
or more of dark-gray to black compact, massively bedded limestone. 
With it are associated bands of black flint and thin beds of argillace- 
ous limestone. The limestone is cut in every direction by veinlets of 
calcite. The formation is similar to the Pennsylvanian limestone of 
the Belted Range, and poorly preserved fossils from a bowlder near 
New Reveille are considered by Dr. George H. Girty to be probably 
of Pennsylvanian age. Inclusions of flint are common in the rhyolite 
described in the following paragraphs, near its contact with the Pale- 
ozoic rocks. 
