16 LARAMIE BASIN, WYOMING. 
Section of ud beds at Red Mountain — Continued. 
Forellc : Feet. 
Fossiliferous rock 4 
Casper: 
Gray sandstone _. . . 20 
Red sandstones j 5 
Interval, not more than 50 
Red sandstone 1 52 
White to red shaly sandstone 96 
Reddish fine-grained monumental sandstone 52 
Shelly drab limestone 2 ,', 
Red sandstones and conglomerates 121 
Red to gray bedded sandstone, with plants 22 
Light to red coarse sandstone and conglomerate 166 
Drab calcareous sandstone li 
Light to red coarse sandstone and conglomerate 86 
Granite. . 
1 . 640 1 
The lower portion of this section was measured on Sand Creek near 
the Pulpit Rock. Another section of the Casper formation, measured 
on the north face of Red Mountain and reaching to the granite at 
the southern base of Ring Mountain, is as follows: 
Section of Casper formation on Red Mountain. 
Feet. 
Fossiliferous impure Forelle limestone (overlain by 67 feet of gypsum 
at base of Chugwater formation) 1 
Buff shale and calcareous sandstone 9 
Massive light sandstone 50 
White arenaceous shale and a little soft sandstone 1 55 
White, soft massive sandstone 18 
White arenaceous shale 20 
Red arenaceous shales and thin, flaggy red sandstone 90 
Pink to white massive sandstone; some arkose '.V.) 
Red shale '. 6 
Sandstone 4 
Red shale and sandstone (limestone nodules at base) I (iJ 
( !( mcealed red beds— shales, sandstones, and arkose 155 
Granite at south base of Ring Mountain. 
608 
In these sections there are only two limestone beds and they are 
inconstant and impure. The monumental sandstones are not promi- 
nent, although they project here and there. Near the crossing of 
Willow Creek, 2 miles east of Willow Springs, a bed of limestone 
1 foot thick lies on conglomerate consisting of rounded quartz, angu- 
lar feldspar, and more or less rounded limestone pebbles. Across the 
creek to the east this limestone becomes more massive and sandy and 
overlies an arkose conglomerate containing masses of nearly pure 
limestone, apparently concretionary, 5 to 6 feet in diameter and 
2 feet thick. This limestone is the second one above the base 
