THE DEVONIAN OF CAPE BRETON—GILPIN. 381 
Art. VII.—THE DEVONIAN OF CAPE Breton. By E. GILPIN, 
Jr. A. M., F.G.S., Inspector of Mines. 
(Read 4th April, 1890.) 
In my last paper on the Geology of this Island, I described 
the minerals of the Carboniferous Division, and have now to 
touch upon the horizon next in descending order. The exact 
delimitation of this horizon palceontologically speaking may yet 
be among the unsettled problems, and the knowledge so far 
learned of its relations in Cape Breton may perhaps be summed 
up by saying that it carries back a step the conditions so widely 
prevailing here at the opening of the Carboniferous. No dis- 
tinctive harvest of the flora permits the correllation of its divi- 
sions It may however be asserted that the position is of more 
importance than the name, and that here it fills a gap, more or 
less completely, between the Silurian and Carboniferous. As 
exposed here it is a formation not of special interest from a 
geological or rninezalogical point of view, and at present the most 
interesting field for study offered by it are the numerous dykes 
and their metamorphic powers, 
Geographically speaking it begins at Loch Jomond, near the 
county line, and runs toward MacNab’s Cove, having a selvage 
of Carboniferous between it and the Pre-Cambrian felsites of 
East Bay. From MacNab’s Cove it runs to St. Peter’s, shewing 
itself at the head of the various coves and indentations, the 
islands and points of land being covered by the Carboniferous. 
From St. Peter’s it fills the shore eastward as far as Lower 
L’Ardoise, where it meets the Pre-Cambrian, and skirting these 
measures runs north-easterly to the Grand River which it 
follows to the place of commencement. Several outliers of 
it are met on the east bank of the river, resting on the fel- 
sites which occupy almost all the shore as far east as 
