A number of articles have appeared in recent years, describing sediments from various parts of the continental shelf, but, in those studies, only a few samples have been available from any particular portion of the shelf. It seemed desirable, therefore, to study an area for which a much larger number of samples was available, especially in view of the abundant evidence, found by the senior author,1 suggesting a contrast between present shelf sediments and those laid down in the seas of the past. These previous studies had indicated, more particularly, that the rule of decreasing grain-size with increasing distance from the shore would not hold for the continental shelf.

The area chosen for this study was the shelf between Delaware Bay and Martha’s Vineyard, represented by a large collection of samples, taken by the United States Coast and Geodetic Survey, and stored, without study, in the United States National . . .

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