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brownstone
Brownstone is a brown Triassic sanstone which was once a popular building material. The term is also understood to be a terraced house (rowhouse) clad in this material.
Trivia about brownstone
(Sarah of the Clue Crew presents from Central Park.) An archway on East Drive is unusual in that it's made from this stone, more associated with apartment houses of the late 1800s
Single-family homes in Manhattan were built with & named for this local sedimentary stone