Abstract
The regions around the borders of our existing continents are, indeed, areas of especial interest and importance to Earth‐science—both because of the major geological problems of these particular areas themselves, and because it is across these thresholds that our explorations of the ocean‐basins must be chiefly projected. For example: Do the steeper, outer slopes of the various continental shelves actually mark the margins of definite continental “blocks,” or are they the scarps of great faults, along which “founderings” of the oceanward crustal segments nave occurred? Or are these outer slopes merely the fore‐fronts of compound submarine deltas, which are extra loads, resting upon a crust which extends continuously from continental upland to ocean‐floor?
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