Comparison of Sand Ridges on the New Jersey Continental Shelf, U.S.A.
R. W. Tillman, J. M. Rine, W. L. Stubblefield, 1985. "Comparison of Sand Ridges on the New Jersey Continental Shelf, U.S.A.", Shelf Sands and Sandstone Reservoirs, R. W. Tillman, D. J. P. Swift, R. G. Walker
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Two linear sand ridges from the nearshore and middle portion of the New Jersey Continental Shelf were sampled using vibracores and box cores. Lithologic descriptions were made of the cores based on epoxy peels, X-ray radiographs, and impregnated core slabs and grain size analysis. Vibracores obtained for the study have an average penetration of 6 m (20 ft.) and 95% recovery. Box cores sampled lithologies and relative abundance of physical and biogenic structures found in the upper 25 to 46 cm (9.8 to 18.1 in.) of the sediment. Bottom topographies were established on the basis of 3.5 kHz seismic data.
The nearshore sand ridge sampled (72°22'W, 39°19'N) exceed 5 km (3 mi) in length and ranges up to 2 km (1.2 mi) in width and has a relief of 6 to 10 m (20 to 33 ft.). The mid-shelf ridge (74°08'W, 39°09'N) is nearly 4 km (2.5 mi) long, up to 1 km (0.6 mi) wide, and has a relief of 10 to 11 m (33 to 36 ft.).
Three to four general lithologic units were recognized; these may be common to both ridges. At the base of many of the cores, nonskeletal mud and poorly sorted sands are present; some of the interlayered sands and muds contain laminations and abundant pebbles. Overlying this unit in the nearshore ridge is a shell-rich mud and sand interval that is relatively massive (bioturbated). This lithology was also recovered in one core from the middle shelf ridge. C-14 dates taken from the shell-rich
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Shelf sandstone reservoirs are becoming a more and more common exploration target. What they are, how they may be characterized, and how they differ from shoreline and deep-water deposits in the subject of this publication. Shelf sands and sandstone reservoirs are among the more poorly understood types of sandstones. Continental, shoreline and deep water sandstones have all been studied in much more depth than have shelf sands and sandstones. However, during the last fifteen years significant progress has been made in understanding shelf sands and sandstones. Studies of modern sediments have allowed us to understand many of the depositional processes active on the shelf. This book is intended to be an up-to-date summary of shelf processes and products. The papers are intended for those new to shelf sands and sandstones as well as the shelf specialist.