474 TERENCE T. QUIRKE 
Great interval of erosion, the resulting sediments being generally unknown, 
but represented in part by Sudburian and other pre-Huronian sediments 
Time of granite intrusions and diastrophism (Laurentian—all inferred 
from the presence of granite bowlders in pre-Huronian conglomerates) 
Deposition of products of Keewatin weathering, accompanied and inter- 
rupted by volcanic extrusions and intrusions of undetermined order and 
distribution 
Note:—The above communication has been made with the permission 
of the Director of the Geological Survey of Canada. 
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