C. S. Corbett takes for granted that the oil from the Athabasca deposit originated in Lower Cretaceous time, and he postulates a very plausible explanation of source materials. The method of accumulation previously presented a real problem to those who supported a Lower Cretaceous origin and this logical exposition is thus additional support for the time of formation, which, as scientific investigations have proceeded, has become increasingly more convincing.
Corbett refers to but does not discuss the question of age, but stresses the manner of formation of the oil. Obviously the two can not be separated in any discussion. It...
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