PARK CITY MINING DISTRICT, UTAH 447 
The formation has no direct economic importance, as it affords 
neither ore bodies nor building stone, nor other economic products. 
Indirectly, however, its tendency to take off surface drainage and its 
enormous capacity for water render it an important factor in mining, 
especially in sinking deep shafts or in running long tunnels. 
Distribution and thickness.—The Woodside shale appears in this 
district in three principal areas. In a highly metamorphosed con- ’ 
dition as spotted dark-red and green argillite it occurs on the north 
face of Jupiter Peak and northward along the east side of Pioneer 
Ridge, and also as an argillite in the gap next west of Lucky Bill gap 
and on the north side of the Quincy spur. In its normal development 
it appears northwest of the Daly West shaft from the Morgan shaft 
to the Diamond-Nimrod shaft and along the west side of Empire 
Canyon, and especially characteristic in the slope above and to the 
west of the Silver King mine. To the east of Park City it reappears 
striking southerly on the eastern slope of the range. 
The thickness of this shale varies considerably. In the type sec- 
tion of Big Cottonwood, which was studied and measured with 
unusual care, this formation was found to be 1,180 feet thick. In the 
Park City district the best opportunity for its determination was 
afforded by the sinking of the deep shaft by the Silver King Con- 
solidated Company, although even this is not entirely free from pos- 
sibly inaccurate estimate owing to faulting. This shaft is located on 
the northeast side of Crescent Ridge just over the divide northwest- 
ward from the Silver King property. It passed through this red- 
shale formation for a distance of 800 feet, which, reckoning the average 
dip as 30°, affords a thickness of 700 feet. 
Age and stratigraphic relations.—No fossils were observed in this 
shale, neither was any stratigraphic evidence found which would 
directly connect this formation in age with either of the inclosing 
fossiliferous formations. Lithologically, however, this shale finds its 
equivalent in one important member and several thin ones in the next 
overlying formation and in the great thickness of red shale of the 
Ankareh formation. ‘These lithologic resemblances show that the 
conditions under which this formation was deposited were those 
which prevailed during the deposition of the succeeding rather than 
that of the preceding formation. Accordingly the Woodside shale 
