1870.] HONEYMAN—GEOLOGY OF ARISAIG. 491 
that these rocks were the type of a considerable proportion of the 
Nova-Scotian Silurian system. My field experience since then has 
confirmed this opinion. All the Upper Silurian rocks that I have 
examined appear to be repetitions of the Arisaig series, wholly or 
partially fossiliferous, and partially metamorphic, or highly meta- 
morphic, and without appearance of fossils, as at Arisaig itself. 
I then observed, in connexion with the B, or second lowest member 
of my Arisaig series, “ that the conditions under which it had been 
formed appeared to have been of a kind not the most favourable to 
the development of life’ This statement requires modification. I 
have found B strata in Arisaig, and elsewhere, somewhat rich in 
fossils. At Arisaig Cove, south of the pier, I found, in the summer 
of 1868, many beautiful specimens of Orthids, Trilobites, Crinoids, 
and Iavosites. In other localities I found abundance of Lingule of 
various species, and a peculiar fossil, singularly and beautifully milled. 
I also observed, in my former paper, that A had been transformed 
into porcellanous jasper at Arisaig pier, Frenchman’s Barn, &e. 
In the summer of 1868, I found, connected with these jaspideous 
rocks, beds of soft material resembling silicates of magnesia, but 
which are now found to be silicates of alumina, which may be em- 
ployed for ornamental and useful purposes. 
In reference to A and B, Dr. Dawson has observed, in his ‘ Aca- 
dian Geology,’ 2nd edition, that Dr. Honeyman had discovered 
strata at Doctor’s Rock which appeared to be somewhat lower than 
his lower Arisaig, and that they were possibly on the horizon of the 
Medina and Oneida of the United States. 
After careful consideration, I have come to the same conclusion, 
and regard the whole Arisaig series as equivalent to the Anticosti 
group. Both localities are situate in the same meridian and in op- 
posite positions on the Gulf of St. Laurence. 
To the east of the fossiliferous group of Arisaig, and in the 
township of Arisaig, is a band of crystalline rocks, which I disco- 
vered in the summer of 1868. ‘These lie on the shore, and extend 
to some distance inland. They appear to be bounded on three 
sides by carboniferous rocks, the fourth side being obscure, covered 
by the waters of Northumberland Strait. A small patch of Lower 
Carboniferous conglomerate with intrusive greenstone, lying in 
Malignant Cove, separates these from the Upper Silurian already 
noticed. The whole band is peculiar and interesting ; but the most 
remarkable feature is a broad stratum of ophiocalcite with ophi- 
olite. The former appeared strikingly to resemble some of the 
ophiocaleites of the Laurentian exhibited in the Canadian Court at 
the Paris Exhibition of 1867. On comparing a polished specimen 
with a specimen of ophiocalcite from Bohemia, containing Hozoon 
bohemicum, I was almost persuaded that the Nova-Scotia specimen 
was Eozoonal too. I took the specimen subsequently to Montreal. 
Dr. Sterry Hunt, on showing it to Sir W. E. Logan in my presence, 
expressed the opinion “ that he thought it to be Laurentian.” Dr. 
Dawson told me that Dr. Hunt had said to him that he considered 
the rocks I had found to be Laurentian. 
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