NOVA SCOTIAN GEOLOGY—HONEYMAN. 273 
; 
Arisaig Series.” In my paper on the I. C. R., I compared the 
formation in question to Professor Ramsay’s Snowdon and 
Cader Idris formation, which it seems strikingly to resemble, 
and adopted the local designation “ Middle Arisaig Series.”— 
Transactions. 
In my examination of the geology of the Eastern Extension 
Railway, in its course through the Marshy Hope, I found that 
the south side of the mountain range had lithological characters 
corresponding with the Cobequid series, as well as the northern 
side. This is followed, too, by the “ Upper Arisaig Series,” 
Member A, of the middle silurian age.—Paper, “Notes on a new 
Geological Progress Map of Pictou County.” — Transactions 
1879-80. 
This led me to consider the mountain formations thus bounded 
to be of pre-middle silurian—Lower Silurian Age.—Transactions 
1879-80. 
While the Arisaig and Marshy Hope Mountains and the Cobe- 
quid Mountains thus possess so much in common as to make 
their relationship unquestionable; the “middle Arisaig series ” 
of the former differs from the latter in having a predominance 
of sub-crystalline rocks. 
A fossiliferous series succeeds both. The fossiliferous series 
of the Cobequids is much different from the “A” member of 
the “ Upper Arisaig series.” Its lithology is different as well as 
the paleontology. Its strata are clayey and soft, while the 
strata of “A” are quartzoze—often very hard. Igneous rocks— 
erypto-crystalline diorites and porphyrites—occur frequently, 
alternating with soft strata in the one, but not in the other. 
The only other formation occurring in Nova Scotia which has 
anything like alternating igneous diorites, are the middle silurian 
magnetites and associate middle and lower silurian strata of 
King’s, Annapolis, and Digby counties.—Vide preceding papers. 
But even these are much different from the fossiliferous and 
crystalline rocks of the I. C. R. As I have shown elsewhere the 
paleontology of the strata in question is of the Cincinnati or 
Hudson River type, while that of A. was regarded by Salter as 
intermediate silurian. The Cobequid fossiliferous series thus 
