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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 39 (1969)No. 4. (December), Pages 1573-1578

Eolian Microridges on Modern Beaches and a Possible Ancient Example

Ralph E. Hunter

ABSTRACT

The structure here named eolian microridges consists of a series of anastomosing ridges less than 1 cm. in Previous HitwaveNext Hit length. Eolian microridges have been observed to form where sand was being blown in saltation across wet sand surfaces, mostly on beaches. The ridges and intervening troughs are oriented transversely to wind direction and commonly have several Previous HittypesNext Hit of asymmetry by which the direction of the wind that formed them can be determined. The structure may be distinguished from ordinary ripples of unusually small Previous HitwaveNext Hit length by several criteria other than Previous HitwaveTop length.

Eolian microridges are potentially preservable, and structures found on several bedding planes of the Keefer Sandstone (Middle Silurian) near Lewistown, Pennsylvania, are possibly preserved examples. These structures, together with other evidence, strongly suggest a beach environment for this sandstone.


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