C. S. Corbett’s proposal of humic acid as a primary source material from which McMurray oil was derived, constitutes a variation in the in-situ-origin hypothesis introduced by Beeby-Thompson and later supported by Ball and Hume. As in the case of the accumulation hypothesis, this new facet of the in situ argument can be credited only to the extent that it is in accord with all known and related data. While there is much detailed information not yet a part of the published record, from recent and extensive investigations which render the in situ position untenable, enough has been published,...
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