454 J. M. BOUTWELL 
of the underlying limestone, and like it are Permian. This definitely 
fixes the lower portion of the Ankareh formation as Permian, but the 
division between this known portion and the overlying shales and 
sandstones which have been considered Triassic, remains undeter- 
mined. In the standard section just below the main sandstone mem- 
ber, and in the Thaynes section in this sandstone succession, petri- 
fied wood and bark were found; but these hardly marked the age of 
the inclosing beds. For the purpose of this report the portion of 
this formation which lies within this district may be considered as 
Permian. The delimitation of the upper part may best be left to 
future workers in adjacent areas where the entire section is exposed. 
Stratigraphically the lower part of this formation is shown by the 
character of the included faunas to belong with the Permian. Doubt- 
less deposition took place without interruption between these forma- 
tions, The transition upward into sandstones, which are well bedded 
and also coarsely crossbedded, points to probable depression from 
shore conditions to slightly deeper water and strong currents. 
TRIASSIC 
Within this district no sediments have been found which carry 
Triassic fossils. To the north and northwest, however, the Park City 
formations pass upward through several hundred feet of red shale 
into brown, red, pink, and white sandstones. These are frequently © 
massive and heavily bedded, in striking occurrences are coarsely 
crossbedded; and toward the top are quartzitic. Disregarding pos- 
sible faulting, they aggregate about 1,550 feet in thickness. The 
age of these sandstones has always been regarded as Triassic, as they 
overlie Permian and underlie Jurassic. 
JURASSIC 
Overlying these sandstones is a succession of fine-grained gray 
limestones several hundred feet in thickness, which yielded sufficient 
organic remains to prove them of Jurassic age. These roughly meas- 
ured 400 feet in thickness, and were overlain by concealed, partly 
calcareous beds about 500 feet in thickness. 
The following forms in these collections have been identified by 
Dr. T. W. Stanton: 
