452 J. M. BOUTWELL 
115 feet in the Park City area, is found 3 miles to the west in the Big 
Cottonwood region and 4o miles to the north in Weber Canyon. 
Still more noteworthy is the occurrence of thin limestones at equivalent 
stratigraphic positions in the formation and bearing identical faunas 
in this district, and again in the Big Cottonwood section 2 to 3 miles 
to the west. Not sufficient work in following special members was 
done to warrant the affirmation that this persistence or equivalency 
is actual stratigraphic continuity, though in the case of the thicker 
formations this is doubtless true, and it is probably true of some of the 
thinner limestones. This striking continuity probably indicates that 
the conditions under which these members were formed were brought 
about over extensive areas by wide-spread land movements of equal 
intensity throughout the region. 
ANKAREH FORMATION 
Name.—The name for this formation is taken from the ridge on 
which it attains its fullest and most characteristic development within 
the district. The ridge has been named by the writer for the purpose 
of rendering descriptions shorter and more definite. One of the most 
striking characteristics of this ridge is the red color imparted by the 
shales, and as ankareh is the word for “red” in the dialect of the Uinta 
Utes, the local Indian tribe, the adoption of the word Ankareh as the 
name of this ridge seems most fitting. ‘The extension of the use of 
this term from the ridge to the formation is no less appropriate, as 
this formation constitutes the base of the main red shale and sand- 
stone formation in the Wasatch, whose striking red color is most 
characteristically displayed on prominent spurs immediately west of 
Park City. 
Character.—As a whole, this formation is composed of siliceous 
detrital deposits. They are chiefly red shales, which frequently 
become sandy through considerable thicknesses. It also includes a 
number of well-marked beds of rather coarse, whitish-gray sandstone, 
which range from 20 to 55 feet in thickness. A few fossiliferous, 
grayish-blue limestones are also intercalated, but these are exceptional 
and only a few feet thick. The division between this and the under-. 
lying formation is made on lithologic grounds, calcareous members 
characterizing the Thaynes formation and siliceous the Ankareh 
