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coquina
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coquina coquina Eight labeled rock samples are shown, including black glassy obsidian, speckled porphyry, striped calico sandstone, shell-filled coquina limestone, coarse breccia, layered banded gneiss, pale green fibrous talc schist, and greenish serpentine.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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limestone
micrite
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coquina
coquinaCoquina outcropping, Washington Oaks Gardens State Park, near Palm Coast, Florida, U.S.

coquina, limestone formed almost entirely of sorted and cemented fossil debris, most commonly coarse shells and shell fragments. Microcoquinas are similar sedimentary rocks that are composed of finer material. Common among microcoquinas are those formed from the disks and plates of crinoids (sea lilies). A coquinite is a stronger, more-consolidated version of coquina, whereas coquinoid limestone is made up of these same shell fragments within a fine-grained matrix.

This article was most recently revised and updated by Richard Pallardy.