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These pectens are very common in the Rushmere Member of the Yorktown Formation in cuts and bluffs along certain portions of the Tar River in North Carolina. Many are extremely worn and even crumble to pieces when handles. Specimens with double valves are not uncommon. This specimen is in exceptional shape. The final picture of the 3 specimens is to illustrate the growth of the species. They are all double valves, and range from 1 /4 inch long to 5 5/8 inch long.