 It got its name from its shape.Only a small portion of this midden remains today as much of it was processed into chicken feed from 1886 to 1891 by the Massachusetts-based Damariscotta Shell and Fertilizer company, eroded by rising sea levels, or looted.Because of this, the Glidden midden, located across the river in Newcastle, is now the largest in Maine and the largest on the U.S. east coast north of Georgia.