STONE QUARRIES IN
PENNSYLVANIA

Pennsylvania's 228 active quarries continue a tradition dating to colonial times, when the state's limestone and slate built Philadelphia and established America's first commercial quarrying operations. The Keystone State's geology spans the Ridge and Valley Province's folded sedimentary rocks, the Piedmont's metamorphic formations, and the Appalachian Plateau's coal-bearing sequences. Today, Pennsylvania quarries supply construction aggregate to the dense Northeast corridor, produce dimension stone for restoration projects, and extract industrial minerals for manufacturing. The state's slate belt near Bangor remains a national center for roofing slate production.