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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 56 (1986)No. 6. (November), Pages 876-879

A Small, Alluvial Crevasse Splay

P. E. O'Brien, A. T. Wells

ABSTRACT

A crevasse splay deposited on the floodplain of the Clarence River in northeastern New South Wales, Australia, by a small, ephemeral tributary provides a guide to the geometry and sedimentary structures of crevasse splays in general and to the processes affecting their final form. The splay consists of a main lobe of sand with smaller sand fingers that end in slipfaces around its edges. Water seeping out of the channel reworks part of the splay into a gently thinning sheet. Small-scale facies models derived from different parts of this splay explain the origins of solitary planar cross sets and gently inclined bedding in some ancient crevasse-splay sandstones.


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