Martha's Vineyard was formed more than 20,000 years ago as great sheets of ice

Martha's Vineyard was formed more than 20,000 years ago as great sheets of ice, as thick as 2 mi, descended from the frigid northern climes into what is now New England, pushing great chunks of earth and rock before them. When the glaciers melted and receded, the island, as well as Nantucket and Cape Cod, remained in their wake. -NY Times