The January Bulletin 1970 is an impressive issue, and the Association is to be congratulated and thanked for assembling such a definitive series of papers dealing with continental margins. It would be impossible to embellish Hollis Hedberg’s mildly quizzical treatment of continental drift, but several specific questions may well be directed to the authors of the two articles that utilize drift and plate tectonics in their interpretations of continental margins.
Emery et al. have found it expedient to date the parting of the continents and the inception of drift as Early Permian (p. 44, 102), specifically as a means...
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