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Physical Features

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Published:
January 01, 1974

Topography and Superficial Deposits

The shoreline northeast from Arisaig Point (Pl. 1) is controlled by the outcrop of the rocks of the Bears Brook Volcanic Group. Between the shore and the Hollow Fault, however, the physical features depend more on the distribution of glacial drift than on the structure of the Paleozoic rocks.

The Hollow Fault, as its name suggests, lies along a valley, the base of which is never more than 400 ft above sea level. It is bordered to the southeast by a steep scarp rising to about 800 ft within 1,500 ft of the valley. This scarp marks the margin of a plateau underlain by Ordovician rocks of the Browns Mountain Group. A few hills, formed by monzonite intrusions, rise above the undulating surface of the plateau.

Williams (1914, p. 41) and Goldthwait (1924, p. 28) describe the plateau as part of a widespread surface extending over the whole of the Maritime Provinces, the remains of this “Atlantic Upland” now being “preserved only on the more resistant rocks.” Goldthwait follows Daly (1901) in considering the plateau to have been planed off in Cretaceous times; the plateau is certainly post-Triassic, but it could be much younger.

In describing the Arisaig region, Williams (1914, p. 44–49) divided the lowlands into “The Shore Front” and the “Carboniferous Lowland.” “The Shore Front” covers the area of Silurian and Devonian rocks around Arisaig, where hills reach a height of 750 ft west of McAras Brook (Pl. 1) and gradually descend northeastward to 650 ft near . . .

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Contents

GSA Special Papers

Geology of the Arisaig Area, Antigonish County, Nova Scotia

A. J. Boucot
A. J. Boucot
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J. F. Dewey
J. F. Dewey
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D. L. Dineley
D. L. Dineley
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R. Fletcher
R. Fletcher
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W. K. Fyson
W. K. Fyson
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J. G. Griffin
J. G. Griffin
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C. F. Hickox
C. F. Hickox
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W. S. McKerrow
W. S. McKerrow
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A. M. Ziegler
A. M. Ziegler
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Geological Society of America
Volume
139
ISBN print:
9780813721392
Publication date:
January 01, 1974

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