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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 57 (1987)No. 2. (March), Pages 288-300

A Sedimentologic Description of a Microtidal, Previous HitFloodNext Hit-Tidal Delta, San Luis Pass, Texas

Alan M. Israel (2), Frank G. Ethridge, Ernest L. Estes


San Luis Pass is a microtidal tidal inlet located at the southwest end of Galveston Island, Texas. Continuous cores taken with a portable vibracoring rig, and surface grab samples provide data for constructing vertical sequences and three-dimensional sedimentologic descriptions of the Previous HitfloodNext Hit-tidal delta complex. These descriptions are based on the type and vertical and lateral distribution of lithofacies, sedimentary structures, textures, and trace fossils.

A vertical sequence through the Previous HitfloodNext Hit-tidal-delta complex consists, from base to top, of: highly bioturbated bay muds and associated oyster reefs; highly bioturbated clayey sand/sandy clay of the tidal delta margin; burrowed sand and shelly sand of the tidal delta; and rooted or burrowed mud of the marsh or mud flat. Washover shell hash deposits may occur at random intervals throughout this sequence. A vertical sequence in the vicinity of San Luis Pass consists of a basal tidal inlet deposit of graded layers of sand and shell overlain by burrowed to shelly sand of the barrier spit. This description of a microtidal, Previous HitfloodNext Hit-tidal delta differs significantly from descriptions presented for mesotidal, Previous HitfloodTop-tidal-delta systems in the 1) general lack of large-scale, high-angle sedimentary s ructures; 2) presence of intense bioturbation; 3) presence of washover deposits; and 4) general coarsening-upward nature of the vertical sequence.

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