Southeastern Massachusetts, Cape Cod, and the islands of Nantucket and Martha's Vineyard consist of outwash from the last glacial maximum, which left thick glacial deposits of sand and gravel, providing the geologic foundation for a rare pine barren ecosystem.
Southeastern Massachusetts, Cape Cod, and the islands of Nantucket and Martha's Vineyard are composed of glacial outwash from the last ice age, which left thick deposits of sand and gravel, forming a unique pine barren ecosystem.