C. D. Waleott— Permian, etc. Groups of Arizona. 221 
Art. XX VI.—The Permian and other Paleozoic Groups of the 
Kanab Valley, Arizona; by C. D. WAuucort. 
[Taken from the report of fieldwork by permission of the Director of the United 
States Geological Survey. 
THE Kanab Valley heads on the high divide between the 
Colorado and Salt Lake Basin, and extends southward, seventy 
miles, through Southern Utah and Northern Arizona to the 
level of the river in the Grand Cafion of the Colorado. It is 
somewhat open in its upper portion before entering the terrace 
_Cafions of the White and Vermilion Cliffs. Opening out be- 
low the latter into a low broad valley, it breaks through the 
escarpment of the Shinarump Cliff, and narrowing a few miles 
to the south, enters the Cafion worn down through the Carbon- 
Lip and Silurian formations to the depths of the Grand 
ation 
During the field season of 1879 a detailed section was taken of 
the strata exposed along its entire course. e section embraces 
13,300 feet of beddgl rocks ranging in time from the Lower 
Tertiary to the Upper Primordial. 
The strata are conformable by dip, although unconformity 
by planes of erosion occurs in several instances. 
n the present note the Permian and other Paleozoic groups 
will be spoken of as they were observed south of the Shina- 
rump Cliff and in the lower Cafion of the Kanab Valley. 
The accompanying tabulation of the subdivisions of the Pa- 
leozoic gives the general stratigraphical features of this portion 
of the section. 
he Permian group terminates above with ripple-marked, 
banded, reddish-brown, and chocolate-colored arenaceous shales 
and sandstone. A plane of unconformity by erosion separates 
it from the overlying Shinarump conglomerate, which is con- 
sidered as the base of the lowest Mesozoic group. It is un- 
doubtedly of Triassic age, but, as yet, this has not been deter- 
mined by paleontological evidence in the Colorado Valley. 
The chocolate arenaceous shales give way below to drab or 
- lavender-colored arenaceous and gypsiferous marls and shales, 
that pass, midway of the group, into reddish-brown shales of 
the same general character. A thin stratum of impure lime 
stone is intercalated in this bed forty-four feet above the sum- 
mit of the lower division and fifteen feet above a band of im- 
pure shaly limestone. This band of limestone is of variable 
