High Quality Content by WIKIPEDIA articles! Gymnophyllum wardi, commonly known as button coral, is an extinct coral from the Pennsylvanian part of the Carboniferous period. The fossils are found in relatively few places worldwide; most specimens are known from the uppper part of the Wewoka formation in and around Lake Okmulgee in Okmulgee State Park or the adjoining Dripping Springs State Park in Okmulgee County, Oklahoma in the United States.

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