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Brownstone is a brown triassic-jurassic sandstone. The term is also used in the United States to refer to a townhouse built of this or similar material. In the 19th century, buswood Island, Wisconsin, was the quarry site of the Bass Island Company, which operated from 1868 until the 1890s. Brownstone from this and other quarries are in great demand in the Apostle islands. It from Basswood islandthey re used in the 1860s to build the first court building in Milwaukee county. The Hummelstown brownstones are very popular on the east coast of the United States, and there are many government buildings from the United States in West Virginia, Pennsylvania, New York, Maryland and Delaware that are completely covered in stone. The stone came from a quarry in hamerstown, Pennsylvania, a small town outside Harrisburg, Pennsylvania. Hummelstown quarry is the largest supplier of brownstone construction on the east coast.