Shelly limestone

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Brachiopods and bryozoans in an Ordovician shelly limestone, southern Minnesota

Shelly limestone is a highly fossiliferous limestone, composed of a number of fossilized organisms such as brachiopods, bryozoans, crinoids, sponges, corals and mollusks. It varies in color, texture and hardness. Coquina is a poorly indurated form of shelly limestone.

Shelly limestone is a sedimentary rock because it is fragmental. To be shelly, it is full of broken shells which are "glued" together with calcite. Calcium carbonate often makes up around 10% of the volume, whilst many varied sized shells from granular to very large pebbles.[clarification needed] Its color is gray.

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