304 
MAZATZAL QUARTZITE 
that is locally marked by thin, basal conglomerates. No Paleozoic 
rocks are observed in actual association with the quartzite in the 
Mazatzal Mountains area. 
On the whole the quartzite beds recline flatly, with only occa¬ 
sional appreciable dips, and the latter for the most part are at 
angles of less than 20 degrees. In the vicinity of the great fault, 
which cuts diagonally across the Range immediately north of 
Mazatzal Peak, the strata are rather steeply inclined. 
A traverse, by F. L. Ransome, up the Deer Creek, on the south 
side of Mazatzal Peak, to an elevation of 6500 feet, and one up 
the North Fork of the same stream, revealed a section of Pre- 
Cambrian quartzites 1400 feet thick. Associated were also shales 
1000 feet in thickness, and comglomerates, all of which appear 
to have been involved in one or more of the same Pre-Cambrian 
deformations to which the schists were subjected. This writer 
also noted that, “Similar quartzite beds were observed to continue 
some hundreds of feet higher, to the crest of the ridge.” It is 
with these higher masses, rather than with the lower ones, that 
this article is concerned. The first mentioned beds are not in¬ 
volved in nearly so much deformative action as those lower down; 
and, furthermore, they contain in their conglomeratic phases 
abundant pebbles of the lower quartzites, schists, and slates. 
The following section ajudged to be the thickest outcrop of our 
quartzite present in the Mazatzal Mountains, is measured between 
the summit of North Peak and the top of the basement schists. 
Mazatzal Quartzites of North Peak 
11. Quartzite, white to bluish grey, fine-grained, but containing bands 
of coarse-grained and cross-bedded materials. Feet, 100 
10. Conglomerate, with pebbles up to one inch in diameter, and con¬ 
sisting of white quartz, red jasper, feldspar, granite and schist. 1 
9. Quartzite, gray, similar to No. 11, but coarser grained. 140 
8. Conglomerate, like No. 10. 3 
7. Quartzite, gray, massive, cliff-forming. 100 
6. Quartzite, brown, massive. 25 
5. Quartzite, reddish, pebbly, often cross-bedded. 80 
4. Quartzite, reddish, vitreous, fine-grained, thin bedded, ripple- 
marked on slaty surfaces. 250 
3. Quartzite, pale brown, vitreous, massive, cross-bedded, weather¬ 
ing to sand. 150 
2. Quartzite, red, massive, often with alternating strata of spotted, 
maroon-colored slates 10 inches thick. 100 
1. Schists of basal complex 
Total thickness. 950- 
