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Showing results for tags 'concentric circle'.
I found several dozen fossils like the one below on Debordieu Beach (~20mi south of Myrtle Beach, SC): can anyone help to identify? They are black, wafer-thin discs, roughly 1 in (2.5cm) in diameter, with a ripples-in-water pattern of concentric circles. Any help with an ID would be most appreciated--thank you!