John's in Newfoundland running
southwesterly about to the point where the Wisconsin joins the
Mississippi, but jutting down to form an extensive peninsula comprising
part of the States of Indiana and Illinois, and you include between them
all of the United States which existed at the close of the Devonian
period. The upper line rests against the granite hills dividing the
Silurian and Devonian deposits of the British Possessions to the north
from those of the United States to the south, Canada itself consisting,
in great part, of the granite ridge.
How far the early deposits extended to the north of the Laurentian
Hills, as well as the outline of that portion of the continent in those
times, remains still very problematical; but the investigations thus far
undertaken in those regions would lead to the supposition that the same
granite upheaval which raised Canada stretched northward in a broad,
low ridge of land, widening in its upper part and extending to the
neighborhood of Bathurst Inlet and King William's Island, while on
either side of it to the east and west the Silurian and Devonian
deposits extended far toward the present outlines of the continent.
Indeed, our geological surveys, as well as the information otherwise
obtained concerning the primitive condition of North America and the
gradual accessions it has received in more recent periods, point to a
very early circumscription of the area which, in the course of time, was
to become the continent we now inhabit, with its modern features.
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