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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Rhomboid Ripple Mark, Indicator of Current Direction and Environment
John H. Hoyt and Vernon J. Henry, Jr.
ABSTRACT
The direction of current flow over the beach surface may be determined from the shape of rhomboid ripple marks. Characteristically these ripples are bowed in the direction of current flow and are pointed up current. They are formed on the foreshore beach by wave backwash and by washover of low bars. The washover ripples result from thin sheets of water moving shoreward over the bars. At Sapelo Island, Georgia, rhomboid ripples are best developed on slopes of 
to 2°. The beach material is predominately fine sand. There is a direct relation between the length-width ratio of rhomboid ripples and the slope of the beach surface.
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