Abstract
A series of negative gravity anomalies found along the southern part of the Rocky Mountain Trench in Canada is interpreted to be the effect of relatively deep basins in the trench floor. These are apparently filled with light material and are separated from each other by regions of only thin cover over bedrock of normal density. The pattern obtained is very suggestive of a system of longitudinal and transverse faults, and the gravity field is therefore consistent with the theory that the trench, in this vicinity, was produced chiefly by downfaulting.
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