658 AL J.P 
Wy 23: Taken at Middle Fork of Crazy Woman Creek, 15 ft. 
above granite. 
Description of hand specimen: Arkose, quartzitic, red-brown, 
massive, coarse, interbedded with finer-grained non-arkosic sand- 
stones. Quartz grains rounded, uniform-sized, up to ¢ in. in 
diameter. Feldspars fresh cleavage fragments, about 33 per cent 
of rock, up to¥ in. in diameter. General vitreous luster. 
Texture granular-fragmental, secondary growth of quartz 
grains. Constituents quartz, 95 per cent; small amounts of biotite, 
limonite, apatite, zircon (?). Cement quartz and limonite. 
One quartz fragment 3 mm., largest otherwise 0.15 mm.; 50 
per cent of quartz 0.8 to 1 mm.; rounded and oval. 
Classed: granitogene fine-grained arkosite. 
Wy 27: Taken at Johnson Creek, 4 ft. above granite. 
Description of hand specimen: Sandstone, massive, buff, with 
ys In. bands of chocolate-brown, doubtless iron stain along obscure 
bedding planes; contains rare pebbles of purplish shale and 
yellowish quartz, minimum § in., maximum 1 in. In general 
medium-grained, friable, subvitreous luster. . 
Texture granular-fragmental. Constituents quartz, 60 to 80 
per cent, dependent on amount of feldspar, now altered to sericite; 
small amounts of microcline, biotite, hornblende, plagioclase near 
oligoclase, zircon, apatite, magnetite, ilmenite (inclusion) as acces- 
sories, and kaolin and sericite as alteration products. Liquid and 
gas inclusions in quartz. Cement limonite, kaolin, sericite, possibly 
chalcedony. 
Quartz vari-sized, largest grain 0.55 by 0.25 mm., no grains 
below o.05mm.; near-angular to subrounded, frequently oval. 
Feldspars suggest secondary growth, averaging 0.05 to o.o8 mm. 
Classed: medium-grained pebbled sandstone. 
Wy 50: Taken % mi. from mouth of tributary, flowing west- 
ward from Hunt Mountain to South Beaver Creek, in float not far 
above granite; similar material in place, 30 ft. south and 1o ft. 
above granite. 
t The belt of exposure is so narrow that this locality seems sufficiently identified. 
