STRATIGRAPHY. 31 
6 miles northwest of Laramie. There are extensive exposures in 
the anticlines east and north of Medicine Bow,in the Freezeout Hills, 
and in the Bootheel Butte ridge west and southwest of Marshall. 
The crest and south slope of Como Ridge consist mostly of this forma- 
tion. It forms a distinct hogback ridge on each side of the Centen- 
nial Valley and occurs in the steep-sided syncline in Jelm Valley 
near Jelm post-office. 
The Cloverly formation consists of sandstones and clays represent- 
ing the formation which has usually been referred to as " Dakota" 
sandstone (Lakota, Fuson, and Dakota formations). Its thickness 
in the Laramie Basin rarely exceeds 200 feet and ordinarily the 
amount is considerably less. It consists nearly everywhere of two 
sandstones separated by buff and purplish sandy clays. The sand- 
stones, especially the lower one, are as a rule locally conglomeratic, 
with pebbles of varicolored cherts and jasper. The lower sandstone 
is the most prominent member topographically, giving rise to a 
notable hogback range in various portions of the region. This 
feature is especially conspicuous in the ridge extending west of Red 
Buttes and west and southwest of the Downey Lakes, Como Ridge, 
the Freezeout Hills, the ridge south and west of Marshall, and a 
prominent knob in the west side of T. 24 N., R. 76 W. 
There is an extensive and complete exposure of the Cloverly for- 
mation in the anticline on the south side of Hutton Lake. The 
dip is nearly vertical and the sandstone runs out into the lake in a 
prominent point. The following beds appear: 
Section of Cloverly formation on south side of Hutton Lake, Wyoming. 
Feet. 
Gray to light-buff sandstone, cross-bedded below, softer above 70 
Coaly shale 1£- 
Sandy clays, greenish buff below, black in middle, and gray near 
top 30 
Sandy shales with two cherty layers 20 
Clays, shales, and sandstones, part dark gray, part purplish 40 
Sandstone, fine grained, soft, with harder and coarser layers 40 
Sandstone, light gray, massive and cross-bedded, in part conglom- 
eratic 35 
Morrison formation. 
Section of Cloverly formation near preceding section. 
Feet. 
Bedded white disintegrated sandstone, shaly at top, slickensided 
between the strata To 
Drab shale 30 
Massive white fine-grained disintegrated sandstone 40 
Dark-brown to black nodular chert 
Light-colored shales and sandstones 70 
Massive white to Light-buff coarse sandstone, crystalline cemenl with 
"patchy" reflect ion (calcite), a very little conglomerate 28 
Particolored shales of Morrison 00 + 
