MICROPEGMATITE IN PURCELL SILLS. 
17 
At the time of his work in this area, through the paucity of 
rock outcrops, he failed to note two bands of sediment in his 
Moyie sill. So, instead of one sill as Daly described, there are 
three sills. This new field fact, which was found by the writer 
in 1910, materially affects the problem of petrogenesis. In 
1911, the writer guided Daly to the several important exposures 
and the section was again carefully studied with the results 
given below. The exposures are not very satisfactory and 
other bands of sediment may be present in sill D. 
The mountain to the west of Kingsgate consists of argillaceous 
quartzites, belonging to the oldest known member of the Purcell 
series, dipping 60 degrees to the east and intruded by sills of 
igneous material. Sections of these sills are given in Figs. 2 
and 3. 
Tabular section of the Moyie Sills. (Measured at a locality 1-J miles distant 
from section illustrated in Figs. 2 and 3.) 
Sills, thicknesses 
Rock zones, thick- 
Character of rock. 
in feet. 
nesses in feet. 
100+ 
Sediments. 
A, 315 ± 
50+ 
Gabbro. 
100 + 
Granite. 
165 ± 
Gabbro. 
100 
Sediments. 
B, 525 
310 
Granite. 
215 
Gabbro. 
45 
Sediments. 
C, 30 
30 
Gabbro 
250 
Sediments. 
D, 438+ 
138 
Granite. 
300+ 
Gabbro. 
56815—2 
