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Brownstone is a brown Triassic - Jurassic   sandstone that was once a popular building material. The term is also used in the United States to refer to a townhouse clad in this, or any of a number of aesthetically similar materials. In the 19th century, Basswood Island , Wisconsin , was the site of a quarry run by the Bass Island Brownstone Company which operated from into the s. The brownstone from this and other quarries in the Apostle Islands was in great demand, with brownstone from Basswood Island being used in the construction of the first Milwaukee County Courthouse in the s.
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