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mods: Genesis and modification of the sand ridges Inner and middle New Jersey shelf, U.S.A Stubblefield, William L. (William Lynn) 1940- creator Kersey, David G. degree supervisor. McGrail David W. degree supervisor. Berg, R. R. degree committee member. Bryant, William R. degree committee member. Fahlquist, Davis A. degree committee member. Stanton, R. J. degree committee member. Texas A & M University degree granting institution. text bibliography Academic theses txu 1980 monographic eng print xv, 246 leaves : illustrations, maps, graphs ; 29 cm Bathymetric, geophysical, textural, and paleontological data provide evidence for the genesis and modification of sand ridges on the New Jersey continental shelf. In a 37 km wide corridor extending 65 km seaward from Atlantic City, New Jersey, 551 surficial grab samples, 12 vibracores, and 291 km of 3.5 kHz seismic data were collected. Closed contours of ridges on the bathymetric map reveal three sets of ridges. Nearshore ridges intersect the coastline at 20° to 30° (nearshore coast-oblique). Seaward of these is a 30 km wide ridge complex with ridges approximately coast-parallel (mid-shelf coast-parallel). Still farther seaward are ridges which trend approximately parallel to the nearshore coast-oblique ridges and thus intersect the mid-shelf coast-parallel ridges at 20°to 30° (outer mid-shelf coast-oblique). Cores taken from the nearshore ridges reveal a medium grain sand which may either coarsen upward or be of uniform texture. Similar cores from the mid-shelf indicate these ridges consist of fine grains and which coarsens upward. Approximately the upper one meter of the mid-shelf ridges consists of coarser sand. The distribution of surficial sediments over the nearshore ridges is asymmetrical in terms of grain size. The sands are coarsest on the shoreward flank and fine toward the seaward flank. On the mid-shelf coast-parallel ridges the surficial sand distribution is more symmetrical with the coarsest fraction on the upper sh…