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An exposure of the Pottsville Formation. The Pottsville is a very coarse-grained sandstone that makes up much of the Allegheny Front.

Pottsville Formation

Buttermilk Falls in Beaver County. Homewood Sandstone (link is external), a common building material in 19th century western Pennsylvania, was quarried on the site.

Buttermilk Falls (Beaver County)

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