thumb|300x300px|Brownstones in Harlem, Manhattan, New York City 300px|thumb|Biking among brownstones in Park Slope, Brooklyn Brownstone is a brown Triassic–Jurassic sandstone that was historically a popular building material. The term is also used in the United States and Canada to refer to a townhouse clad in this or any other aesthetically similar material.
thumb|300x300px|Brownstones in Harlem, Manhattan, New York City 300px|thumb|Biking among brownstones in Park Slope, Brooklyn Brownstone is a brown Triassic–Jurassic sandstone that was historically a popular building material. The term is also used in the United States and Canada to refer to a townhouse clad in this or any other aesthetically similar material.
Brownstone was a popular building material because it is unusually easy to quarry and carve; these qualities also make structures clad in it susceptible to weathering and damage over time.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).