. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 310 HUNT AND OTHERS 0 2 4 6 8 10 12 Km INNER RIDGE MIDDLE RIDGE 1 1 LIGHT TOWER RIDGE SAND WAVES -ja\.. â¢f«^ SAMD â¢:â¢:â¢:â¢: sparse waves kjOCMt mM^ - - _ â â CLAY SUBSTRATE â iH Om lOm - 20m - 30m OO LAG GRAVEL Figure IS. Cross-shelf profile north of main sand-wave field based on seismic profiles, grab samples, and photographs. Areas of sandwaves are shown on surficial sand sheet as well as rela- tion of ridges to pre-Holocene substrate
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 310 HUNT AND OTHERS 0 2 4 6 8 10 12 Km INNER RIDGE MIDDLE RIDGE 1 1 LIGHT TOWER RIDGE SAND WAVES -ja\.. â¢f«^ SAMD â¢:â¢:â¢:â¢: sparse waves kjOCMt mM^ - - _ â â CLAY SUBSTRATE â iH Om lOm - 20m - 30m OO LAG GRAVEL Figure IS. Cross-shelf profile north of main sand-wave field based on seismic profiles, grab samples, and photographs. Areas of sandwaves are shown on surficial sand sheet as well as rela- tion of ridges to pre-Holocene substrate. Bathymetry is from the Coast and Geodetic Survey smooth sheet H-8808, 1963. ,, 35»15'. Figure 16. Net-change map of Diamond Shoals, 1953 to 1963. After Swift and other (1972). Note erosion on north slope and deposi- V tion on south slope. lliin 10 FEET OF EIOSION r= 10 FEET OF DErOSITION â 40 FOOT CONTOUR 0*63) DATA BOUNDARIES may likewise have discharged into the Hat- teras Canyon system during low stands. Diamond Shoals in fact may have been in- itiated as a low-stand cuspate delta ances- tral to Cape Hatteras, although it has since clearly led an independent existence as a cape extension shoal, focusing wave energy on and being nourished by its associated cuspate foreland (Swift and Sears, 1974). However, our observations lead us to suggest that since the beginning of the Holocene transgression, a significant part of the surficial sand sheet of the shelf to the north has been delivered to the shelf edge of the study area. Rona (1970) noted that the heads of the Hatteras and tributary canyons on the upper slope off Cape Hatteras are buried beneath a cap of foraminifera-rich silt raining out of the Gulf Stream. Sand de- livered to the zone of reversing flow at shelf edge does not therefore bypass direaly into the canyons at present; it must instead mix with the fine, relatively "sticky" pelagic ma- terial and cause the slope to prograde. Suc
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