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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Research Articles: Biogenic Sedimentary Structures
Biogenic Cross-Lamination Produced by the Pistol-Shrimp Alpheus bellulus in Microcosm Experiments
Abstract
Study of aquaria containing the shrimp Alpheus bellulus and poorly sorted, coarse-grained sand has revealed the potential for macroorganisms to create structures closely resembling ripple cross-lamination, including climbing-ripple cross-lamination. A. bellulus excavates decimeter-scale craters in the sediment, carrying sediment grains up the steep inner (stoss-equivalent) slope of the crater and depositing them on the outside (lee-equivalent side). The fabrics produced resemble hydrodynamically produced ripple cross-lamination, particularly when observed in the limited cross sections available in core. This biogenic cross-lamination can be distinguished from hydrodynamic cross-lamination in that the biogenic cross-lamination is steeper than is typical for current-generated ripple cross-lamination, the tabular foresets are close to angle of repose, and the structure has a circular ripple crest.
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