Flip to The north east Grenoble Quarry, Northampton Township between Ivyland and Rushland, Bucks County, PA, circa 1910.
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Credit: Pennsylvania, Keystone to Progress, by Edward Miller
When slate use reached its peak in the early 1900s, Pennsylvania's "slate belt" accounted for nearly half the slate quarried in the United States. The use of slate roof shingles began to decline after 1910, as builders shifted to new asphalt shingles, which were less expensive and easier to install.