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Comparison of Sand Ridges on the New Jersey Continental Shelf, U.S.A.

By
R. W. Tillman
R. W. Tillman
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J. M. Rine
J. M. Rine
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W. L. Stubblefield
W. L. Stubblefield
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Published:
January 01, 1985

Abstract

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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Contents

SEPM Short Course Notes

Shelf Sands and Sandstone Reservoirs

R. W. Tillman
R. W. Tillman
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D. J. P. Swift
D. J. P. Swift
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R. G. Walker
R. G. Walker
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SEPM Society for Sedimentary Geology
Volume
13
ISBN electronic:
9781565762428
Publication date:
January 01, 1985

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