Slate Island is an uninhabited island of about (at high tide) in

Hingham Bay Hingham Bay is the easternmost of the three small bays of outer Boston Harbor, part of Massachusetts Bay and forming the western shoreline of the town of Hull and the northern shoreline of Hingham in the United States state of Massachusetts. It ...

, an arm of

Boston Harbor Boston Harbor is a natural harbor and estuary of Massachusetts Bay, located adjacent to Boston, Massachusetts. It is home to the Port of Boston, a major shipping facility in the Northeastern United States. History 17th century Since its dis ...

. It is part of Boston Harbor Islands National and State Park and is just east of Grape Island. The island mostly consists of

slate Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade, regional metamorphism. It is the finest-grained foliated metamorphic ro ...

outcrops partly covered with

glacial till image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...

, and the shore is mostly rock. The highest elevation is . The island was visited seasonally by Native Americans. In colonial times slate was quarried from the islands (the remnants of the quarry are still visible), mostly for house foundations. William Torey was given a grant for the island in 1650, with a stipulation that anyone was free to extract slate. Slate mining continued to a small degree into the 20th century and contributed to soil erosion on the rocky island. Later owners included Joseph Andrews, Samuel Lovell, Thomas Jones, and Caleb Loring. In the 17th century the island became part of the town of

Hull Hull may refer to: Structures * The hull of an armored fighting vehicle, housing the chassis * Fuselage, of an aircraft * Hull (botany), the outer covering of seeds * Hull (watercraft), the body or frame of a sea-going craft * Submarine hull Ma ...

(it is now in Weymouth). Around 1840 a hermit (his name lost to history) lived in a hut near the southern cove. ( Moses Forster Sweetser opined that "his lonely hut must have made Thoreau's hermitage at Walden seem like

Scollay Square 300px, Scollay Square, Boston, 19th century (after September 1880) 350px, Scollay Square, Decoration Day, 19th century (after September 1880) Scollay Square (c. 1838–1962) was a city square in downtown Boston, Massachusetts. It was named for ...

after a theatre performance.") In the 1890s owner Edwin Clapp gave the island to the Clapp Memorial Association, which briefly hosted a summer camp there. Slate Island was privately owned until the 1970s when it became public property and part of the Boston Harbor Islands National and State Park. There are no trails, docks, or any other facilities on the island, which is overrun with vegetation including an abundance of

poison ivy Poison ivy is a type of allergenic plant in the genus '' Toxicodendron'' native to Asia and North America. Formerly considered a single species, '' Toxicodendron radicans'', poison ivies are now generally treated as a complex of three separate s ...

. The island is not serviced by the park ferry.

References

{{Boston Harbor Islands Boston Harbor islands Weymouth, Massachusetts Islands of Plymouth County, Massachusetts Coastal islands of Massachusetts