MICROPEGMATITE IN PURCELL SILLS 
19 
SHI A 135 ft. thick 
Sill B 30 ft .thick 
Sill C 91 Oft. thick 
Sill D 1 500 ft. thick 
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AVERAGE 
ROCK TYPES 
SPECIFIC 
GRAVITY 
THICKNESS 
quartzite 
. 2-76 
200ft. + 
2-96 
26 ft. 
granite 
gabbro 
2 76 
80 ft. 
2 97 
JJ9 ft . 
quartzite 
.. .2-76 
100 ft. 
gabbro 
....2-93 
30 ft 
quartzite 2-76 670 ft . 
granite P-74- 200 ft, 
intermediate rock 2 85 — .87 ft . 
gabbro 3-00 623 ft . 
quartzite.- 2'76 -75ft. 
gabbro . .2'99 1500ft. 
quartz ite .... 276 .200 ft .+ 
Scale of feet 
o *oo >o o 
Fig. 3. Columnar section of the Moyie Sills. 
56815— 
