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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Regional Patterns of Cross-laminae and Convolutions in a Single Bed: NOTES
Robert G. Sutton, Thomas L. Lewis
ABSTRACT
The Bluff Point Siltstone, a thin bed that occupies an area of at least 300 square miles in west-central New York, was deposited on a west-northwest dipping paleoslope during late Devonian time. It is marked everywhere by cross-laminae with a mean direction of 299 degrees and by convolutions whose axes have a mean orientation of 273 degrees. The orientation of convolute axes is clearly related to the flanks of depressions of cuspshaped ripples. Slight but critical shifts in current direction during deposition cause filling of the depressions between ripples and this load caused a lateral transfer of material to the flanks. The bed is believed not be a turbidite.
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