30 TRANSACTIONS OF THE [ocr. 28, 
the limestone which is “of considerable, though undetermined 
thickness,” and rest on the Coast range granites. Precisely > 
the same differences obtain between the Glacier bay argillites 
and those at Wrangell, Sitka and Junean, and the order of suc- 
cession is the same in each of the four sections, Stikine, Taku, 
Dease and Glacier Bay. 
The one difficulty encountered in making this correlation is 
that the strike of the Glacier bay series would bring them over 
to Lynn canal, and that Dawson reports from the east side of 
Lynn canal argillites that he likens to those of Wrangell.* In 
a region so complicated structurally and so little known it is 
difficult to assign causes for such apparent discrepancies. 
Beyond this point it is not easy to carry any satisfactory identifi- . 
cations. In the sections of Dawson and Hayes the Coast range 
granite intervenes between the Paleozoic rocks of the interior 
and the argillites of the coast, which are perhaps of Mesozoic 
age. This rock is always reported as a gray granite, and diorite 
is only reported as occurring in local intrusions in the granite. 
Quartz-diorite is not reported at all of the four specimens of 
this granite from the Stikine which were examined microscopi- 
cally by Dr. Adams,} though one had predominant plagioclase and 
is stated to appaoach quartz-diorite in character. But the Glacier 
bay quartz-diorite contains but little orthoclase, and so far as 
known shows no tendency to grade into granite. Dawson de- 
scribes the granite as follows: ‘‘The Coast ranges, where 
traversed by the valley of the Stikine and again where crossed 
still further north by the Chilkoot Pass, are found to consist for 
the most part of granite and graintoid rocks, almost invariably 
of gray color, and frequently. rich in hornblende. With these 
are occasionally included stratified or stratiform masses of mica- 
schists and hornblende-schists, and both these and the granites 
are frequently traversed by pegmatite veins, diabase dykes and 
intrusive masses of coarse diorite.”{ Dr. Dawson found here 
no especial evidence as to the age of this granite, but believes it 
to be the same as on Vancouver Island, or Middle Mesozoic. 
On the other hand, Hayes reports basal ‘conglomerates in the 
Taku valley, resting on what seems to be the same granite, 
though it may be different, or the conglomerates may not be 
Paleozoic. 
No granite has yet been found in the Glacier Bay section nor 
on the moraines of the glaciers which come into the bay. In- 
tervening between it and the Fairweather range is a rugged, 
* Geol. Sury. Can. An. Rep. 1887-8, p. 32 B. 
+ F. D. Adams, Geol. Sury. Can. An. Rep. 1887-8, p. 237 B. 
t Geol. Sury. Can. An. Rep. 1887-8, p. 31 B. 
