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About Johnson QuarriesPA Blue Stone is a unique often blue but can also contain rust, tan, brown, green, black and lilac. Bluestone flagstone is a dense, strong, and stable layered sandstone created over 360 million years ago from ancient oceans, rivers, and lakes were sediment deposited in the Acadian Mountains/Catskill Delta region. Selling 360 Million Year Old Pennsylvania Bluestone
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