444 J. M. BOUTWELL 
and forming the top of Treasure Hill, are various types of siliceous 
beds, sandstones, quartzites, etc. 
The exposure in the type section a few miles to the west in Big 
Cottonwood Canyon presents the best section observed. 
Tyre SEcTION, BiG CoTroNwoop CANYON 
Description 
Thickness 
in Feet 
19 Grayish-white limestone, with fine gray and white cherts increasing toward 
bettom. 
I9 Shale and fine buff sandstone. 
7 Dark-gray limestone, thin chert, red shale, and porous loose member at 
base. 
II Sandy shale. 
21 Yellowish-gray quartzitic sandstone, changing into cherty white limestone 
below. 
52 Gray and white banded chert, with few white sandstone intercalations. _ 
8 Fine calcareous sandstone, with lentils of chert and brecciated fragments 
of sandstone. 
104 Float of buff sandstone and shale, becoming more shaly and calcareous at 
base. 
18 Siliceous arkose, comprising mainly rounded quartz grains and feldspars 
cemented with ferruginous material. 
20 Compact grayish quartzite. 
8 White, compact, sugary sandstone, fossiliferous at base. 
30 Fine gray and pink, massive quartzite, with brown sandstone and gray- 
white chert bands near base. 
27 Light-gray limestone, weathering whitish gray with an imbricated pattern; 
fine gray limestone near base; carries good faunas at two horizons in 
particular, 20 and 55 feet above the base respectively. 
24 Gray calcareous sandstone. 
9 Fine gray limestone. 
36 Float showing bits of grayish and brown calcareous sandstone. 
22 Sandy limestone, more calcareous at base, with cavernous weathered sur- 
face. 
31 Float, upper sandy beds at top of Weber quartzite. 
Distribution.—The Park City formation extends around the center 
of the district in the general form of a U (with base pointing north). 
Its irregular and interrupted outcrop stretches from Bonanza Flat 
northward across the prominent eastern spur, passing the Daly West, 
Daly, and Silver King mines, thence northerly to a point opposite 
