STRATIGRAPHY. 29 
On the east side of the Centennial Valley the formation presents 
features similar to those in Red Mountain, containing two thin beds 
of limestone, but the thickness is more than 300 feet. 
The formation outcrops on the west bank of Laramie River just 
north of the bridge a mile northwest of Laramie in a low mound 
capped by terrace gravels. The beds comprise 3 feet of dark shales 
at the base, then 20 feet of soft, massive light-colored sandstones, and 
finally 10 feet of gray shales with several thin slabby limestone layers 
(one of which is pebbly) and a thin layer of gray sandstone. Expo- 
sures of moderate extent appear in the slopes l\ to 2 miles south- 
southwest of Howell station. The lower beds are soft, massive buff 
sandstones. These are overlain by gray and greenish-gray massive 
shale or clay with thin cherty limestone and sandstone layers. One 
of the latter is 2 to 3 feet thick. At the top are very dark shales 
which have been prospected for coal. They are overlain by coarse 
sandstones at the base of the Cloverly formation. 
In the exposures west of McGill a 2-foot bed of limestone is included 
in the formation. 
In the Freezeout Hills the Morrison formation presents its usual 
characteristic features. According to a description by W. N. Logan a 
it consists of clays and sandstones and its limits are somewhat uncer- 
tain. A section near Dyer's ranch given by Logan is as follows: 
Section of Morrison formation in Freezeout Hills, Wyoming. 
Feet. 
24. Grayish-white sandstone (may be basal ( 'loverly) 50 
23. Drab clay, with saurian remains 70 
22. Brown to bluish-gray sandy limestone, with niollusean fossils. 1 
21. Bluish-green clay, with very small concretions; dinosaurs and 
mollusks « 30 
20. Fissile brownish sandstone; no fossils 4-5 
19. Drab clay; dinosaur remains 30-40 
18. Sandstone, grayish to light brown, in part cross-bedded, on 
2\ feet of conglomerate; fossil wood and cycads 10-20 
17. Purplish to greenish clay, with dinosaurs in upper part GO 
16. Grayish-white sandstone, fine grained, in part cross-bedded, 
moderately soft 10-125 
The lowest bed in this section is only 10 feet thick at Dyer's ranch, 
bul increases to 125 feet a few miles south. It is separated from beds 
carrying Sundance fossils by 40 feet of purplish clays which may 
belong to the Morrison formation. 
Fossils and age. — Large numbers of dinosaurian bones have been 
obtained from the Morrison formation, notably from the extensive 
bone quarries near "Bone Cabin," in the northeastern portion of I lie 
Freezeout Mountains. They comprise Brontosaurus , Morosaurus, 
Ornitholestes, Laosaurus, Camptosaurus, Dryosaurus, Diplodocus, 
Stegosaurus, and Allosaurus, (lie (wo last mentioned occurring in 
a Op. Cit., pi). 113-113. 
