Brachiopod

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A Paleozoic brachiopod shell partly broken to show the internal spiral arm-supports. Mississippian limestones. Note the symmetrical character of the shell with reference to a median line drawn through the apex of beak.

Keywords

shell, limestone, Brachiopod

Galleries

Brachiopods

Source

Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 309

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