Article
Article
Coquina
Article By:
Siever, Raymond Formerly, Department of Geology, Harvard University, Cambridge, Massachusetts.
Last reviewed:August 2020
DOI:https://doi.org/10.1036/1097-8542.161400
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A calcarenite or clastic limestone whose detrital particles are chiefly fossils, whole or fragmented. The term coquina is most frequently used for an aggregate of large shells more or less cemented by calcite (see illustration). If the rock consists of fine-sized shell debris, it is called a microcoquina. Encrinite is a microcoquina made up primarily of crinoid fragments. Some coquinas show little evidence of any transportation by currents; articulated bivalves are preserved in entirety and the shells are not broken or abraded. See also: Limestone
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