Criteria for the definite distinction between the various formations of the Cretaceous section of Alberta are few and practically non-existent in print. For this reason one is confronted with difficulty in arriving at a definite conclusion regarding what formation is encountered in a drill hole which passes through a fault of such great displacement as the Turner Valley sole fault. This is particularly true if only a limited amount of drilling is done in the doubtful formation. In British Dominion No. 1, where the fault was encountered at a depth of 5,480 feet, and where drilling was carried to a...

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