ee ee ee Ie ee ee eke _s 
Geological Survey of the Territories in 1872. 195 
_. the whole of No. 4, must belong to the Quebec Group. 
er part of No. 3 may possibly represent the Upper 
Silurian, since the characteristic Niagara coral, Halysites catenu- 
latus, was obtained by Dr. Hayden, in 1871, in Box Elder 
Cafion, about 25 miles north of Ogden, from a bed of limestone 
which appears to belong to this member of the section. The 
quartzites of No. 2 give no indication as to their age, but are 
referred to the Devonian merely on account of their relative 
position. The Carboniferous limestones of No. 1 are in some 
places quite fossiliferous, though mostly not so. On a_ hasty 
trip to the mining districts of Little Cottonwood Caiion, 
levels, though only three are prominent along most of the bor- 
€r of the basin, run above Malade City ; and the uppermost 
one apparently coincides so nearly with the summit of the 
divide as to leave one in doubt whether or not there was 
