Furrowed outcrops of Eocene chalk on the lower continental slop offshore New Jersey

Geology
By: , and 

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Abstract

A sea bottom of middle Eocene calcareous claystone cut by downslope-trending furrows was observed during an Alvin dive to the mouth of Berkeley Canyon on the continental slope off New Jersey. The furrows are 10 to 50 m apart, 4 to 13 m deep, linear, and nearly parallel in water depths of 2,000 m. They have steep walls and flat floors 3 to 5 m wide, of fine-grained sediment. Mid-range sidescan-sonar images show that similarly furrowed surfaces are found on nearby areas of the lower continental slope, not associated with canyons. The furrows are overlain in places by Pleistocene sediments. Although they show evidence of erosional origin, they do not appear to be related to observed structures, and their straight, parallel pattern is not well understood. A general cover of flocky unconsolidated sediments implies that bottom-current erosion is not active now.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Furrowed outcrops of Eocene chalk on the lower continental slop offshore New Jersey
Series title Geology
DOI 10.1130/0091-7613(1983)11<182:FOOECO>2.0.CO;2
Volume 11
Issue 3
Year Published 1983
Language English
Publisher Geological Society of America
Contributing office(s) Woods Hole Coastal and Marine Science Center, Coastal and Marine Geology Program
Description 5 p.
First page 182
Last page 186
Country United States
State New Jersey
Online Only (Y/N) N
Additional Online Files (Y/N) N