Index map
Festoons of terminal moraines marking the southern
limit of Pleistocene glaciation
were deposited on a submarine ridge of Tertiary rocks off the
coasts of Massachusetts and Connecticut 15,000 to 20,000 years
ago. These hummocky piles of clay-rich, poorly-sorted glacial
material, and the smoother plains of sandy outwash deposits
immediately south of them, form much of Long Island, Cape Cod,
Martha's Vineyard, and Nantucket Island. They also controlled
the post-glacial development of beaches, offshore islands, and
other Holocene coastal landforms.
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