Robert Morris Jones, circa 1880.
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Photograph of Jones, head and shoulders, and the words His Spirit Lives On.

Credit: Courtesy of Lehigh University

Although small quarries operated along the Pennsylvania-Maryland border as early as the 1730s, the Pennsylvania slate industry took off after Robert Morris Jones immigrated from Wales in 1846 and began to quarry slate in a section of Northampton County he would name Bangor. Bangor would soon become known for its high quality slate, and become an anchor of the Pennsylvania "slate belt," a twenty-two-square-mile area south of Blue (Kittanning) Mountain between the Lehigh and Delaware Rivers.

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