BELTED RANGE, GENERAL GEOLOGY. 1 If) 
Remnants of a more mature mountain surface surrounded by recent 
cliffs and rugged hills occur on Wheelbarrow Peak, on the high peak 
3 miles north of it, and in the rhyolite area 5 miles west of south of 
Wheelbarrow Peak. The old land surface extends 2 miles cast of the 
first-named points. The smooth and gentle slope of this surface is 
shown on the map, although it is somewhat obscured by the use of 100- 
foot contours on so small a scale as 1 inch to 4 miles. These mature 
areas are characterized by few and inconspicuous rock outcrops ami 
a deej) soil covered by grass and trees. The contrast between this 
topography and the sharp ridges and cliffs, practically all a single 
rock exposure, of the younger topography is very great. Since tin- 
old mountain surface developed the Belted Range has been tilted to 
the east and the older surface has been completely removed from the 
west versant of the range. (See fig. 11.) 
The range north of Belted Peak is bare, but south of this point 
there is a fair growth of pirion and juniper above G,500 feet, although 
the southern quartzite and slate hills are as a rule without timber. A 
few oak shrubs grow in moist places. The tree yucca and the Span- 
ish bayonet are common on the upper alluvial slopes in the vicinity 
.OLD TOPOGRAPH 
Fig. 11. — East-west profile across Belted Range 3 miles north of Wheelbarrow Teak, 
showing mature character and present eastward tilt of Pliocene surface. 
of Oak Spring. Cliff and Indian springs each flow about r>00 gal- 
lons of water per day; Wheelbarrow Spring is weak and is probably 
dry during a part of the summer. Oak, Whiterock, and Captain 
Jack springs all flow from the Siebert lake beds. Oak and White- 
rock springs each flow from 1,500 to 3,000 gallons a day; Captain 
Jack Spring is considerably smaller. 
GENERAL GEOLOGY. 
The formations of the Belted Range, from the oldest to the young- 
est, are as follows: Pogonip limestone, Weber conglomerate, Penn- 
sylvanian limestone, monzonite, post- Jurassic granite, andesite, 
earlier rhyolite, Siebert lake beds, later rhyolite, and basalt 1 . 
SEDIMENTARY ROCKS. 
Pogonip limestone. — The Pogonip limestone forms low hogback 
hills on the western border of the Belted Range from a point 1 > 
north of the Kawich-Indian Spring road to the north end of the 
range. Inclusions of the same rocks occur in the rhyolite and are 
particularly abundant near its contact with the limestone. A thi< 
