Abstract

Werenskiold's hypothesis requires that a ‘great supply’ of sediment be available for the filling of deep oceanic troughs off some sectors of the young Tertiary mountain ranges of the Pacific borders. He postulates that the sediment came from or through these ranges. The writer has been in the habit of explaining the absence or small development of coastal plains and continental shelves off such ranges as due to the small volumes of sediment coming from or through the mountains in relation to the abundance of sediment from continental interiors or mountains fronted by a broad piedmont belt or broad coastal plain already formed. The time factor also must, of course, be considered.

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