WaRD.] JURASSIC CYCADS FROM WYOMING. 885 
deposits was very great, and-I gladly availed myself of Professor 
Knight’s generous offer to go with me to the locality. An arrange- 
ment was made to meet him at Laramie September 1, 1899, for this 
purpose. I was there at the appointed time, and a small party started 
on the 2d and reached the Freezeout Hills on the 3d. 
The Freezeout Hills occupy an area some 10 miles square in about 
latitude 42° 7’ N., longitude 106° 15’ W. from Greenwich, and lie 
principally in T. 25 N., R. 79 W. Its topographic position is 
between the Big and Little Medicine rivers, which unite to form Rock 
Creek 10 miles due south of: its central portion; but Muddy Creek, a 
branch of the Little Medicine, bounds the area on the north and east 
sides, while tributaries of the Big Medicine have their origin in its | 
western portion. The highest of the hills iscalled Freezeout Mountain, 
the name being derived from a somewhat vague tradition that in early 
times an entire party of men were frozen to death in its immediate 
vicinity. The general uplift, which nowhere exceeds 8,000 feet, 
extends in a southeasterly direction to Medicine Bow and beyond. It 
is in one of the spurs of it, 7 miles east of the last-named place, 
and opposite the station called Aurora, on the Union Pacific Railroad, 
in the valley of Rock Creek, that the famous Como Bluff is located, in 
which dinosaurian remains were early found, and which furnished the 
well-known section so often published by Professor Marsh. 
In traveling north from Medicine Bow, areas of Fort Benton and 
Dakota are passed over before reaching the Little Medicine, 5 miles 
from that place, in the valley of which the Jurassic is exposed, under- 
lain by the Red Beds, both of which look very familiar to one acquainted 
with the Black Hills. The beds dip rapidly to the south, and there is 
an anticline to the north of the Little Medicine, the summit of which 
consists of a curious white sandy limestone, probably Permian in age, 
and comparable to some of the Permian beds of Kansas. Beyond this 
there is a wide plain, over which, at favorable places, the Jurassic and 
the Red Beds again successively make their appearance. Crossing 
this plain, a distance of some 12 miles, the southeastern border of 
the Freezeout Hills is reached. They are somewhat isolated and slope 
gradually to the east, while the west end of the spurs presents a ragged 
escarpment. The wagon road passes around them on the east, while 
at their western bases there is a somewhat narrow valley. As the 
geology can be much better studied on the west side, several members 
of the party, including Professor Knight and myself, took through 
this valley on foot from Trabing Brothers’ ranch to the cabin which 
had been erected by the University of Wyoming on the north side of. 
the hills, a distance of 6 miles. We thus passed along the foot of 
Freezeout Mountain, which rises 600 feet above the plain. The strata 
were seen dipping to the southeast, exposing at the base of the cliffs 
heavy beds of massive light-colored limestone, which weathers red and 
20 GEOL, PT 2-——25 
