PARK CIS MUEN TING “DESERICT.. SIA 443 
sion of calcareous sandstones, normal sandstones, and arenaceous 
quartzites immediately above characteristic massive Ontario quartzite 
—apparently a normal transition. In Big Cottonwood Canyon, a 
few miles to the west of this area, the quartzite gives way upward to 
a sequence of sandy beds. In Weber Canyon the precise contact 
was not sufficiently exposed to demonstrate conformability, but the 
limit and extent observed gave no evidence of unconformity. 
Immediately overlying normal Weber quartzite is a coffee-colored 
and white sandstone, variably coarse and fine, about 150 feet thick, 
succeeded by the regular calcareous succession. 
These accordant features, lack of reliable evidence of unconform- 
ity, and a lithologic succession tending to show conformity between 
these formations, are further supported by paleontologic evidence. 
In the Park City District the base of the overlying limestone formation 
carries a distinctive fauna. Members of this same fauna, as indentified 
by Dr. Girty, occur in Weber Canyon in the equivalent limestone at 
a corresponding distance above the quartzite (about 250 to 300 feet), 
and also about 1,800 to 2,000 feet below in Weber quartzite. This 
fact in itself seems to show conclusively that no break in the paleonto- 
logic succession took place, and thus that there was no break in the 
sedimentation, or, in other words, that the Weber quartzite and the 
overlying limestone formation are conformable. 
PARK CITY FORMATION 
Name.—The Park City formation is named after the district, 
in recognition of the fact that it is the formation which has yielded the 
bonanzas that during the last decade have made the district famous. 
Character.—This formation is made up in large part of calcareous 
members, but it also embraces several sandstones and quartzites. 
In general, it comprises a thick limestone in its lower part, several 
minor limestones in its upper part, and a number of thin calcareous 
beds toward the base, with intercalated quartzites and sandstones. 
Along the King road the lower portion of the formation is seen to 
be made up of normal gray limestones, cherty limestones, brown 
calcareous and shaly sandstone, red, brown, and olive shales. The 
lower half of the formation is there seen to include two important 
limestone members and three minor quartzites. Overlying these, 
