. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography ohelf Sedimentation characterized by long, straight coast compart- ments, alternating with the mouths of master river systems that have been drowned to form large erosional estuaries. Relatively little sediment passes down these rivers from the temperate, glaciated hinterland, and the estuaries are able to efficiently trap it out and to trap out the littoral drift of the adjacent coastal compartments as estuary mouth shoals (Meade, 1969). In the Mid
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography ohelf Sedimentation characterized by long, straight coast compart- ments, alternating with the mouths of master river systems that have been drowned to form large erosional estuaries. Relatively little sediment passes down these rivers from the temperate, glaciated hinterland, and the estuaries are able to efficiently trap it out and to trap out the littoral drift of the adjacent coastal compartments as estuary mouth shoals (Meade, 1969). In the Middle Atlantic Bight, a large-scale depositional fabric consists of an alternation of shelf-transverse thickenings in the sand sheet (Swift and Sears, in press). These shelf valley complexes tend to consist of a partially filled river-cut valley paired with a shoal-retreat massif. The fill .of the subaerial valley may have a narrow channel incised into it. Thinner sand blankets, the product of ero- sional shoreface retreat, occur on the plateau-like interfluves. Shelf valley complexes cannot always be traced to their littoral generating zone as a consequence of changes in the littoral sedimentation pattern attendant on the late Holocene reduction in the rate of sea-level rise (Milliman and Emery, 121 1968). The narrow Delaware Shelf Valley, however, can be traced directly into the flood-dominated channel that adjoins, in an echelon fashion, the ebb-dominated channel of the inner estuary mouth (Fig. 4). Such mutually evasive ebb-flood channel couplets are characteristic of estuary mouths (Lud- wick, 1973) and the Delaware Shelf Valley is, in fact, the retreat path of the flood-dominated mem- ber of the pair. It only approximately follows the trend of the buried river-cut valley beneath it (R. Sheridan, personal communication). The north-rim high is similarly the retreat path of the north-side estuary mouth shoal that serves as a depositional focus for the New Jersey coastal compar
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