The following excerpt is from "Delta Borough History" found at http://v6neon.homestead.com/HISTORY.html
"Slate in neighboring Peach Bottom Township and green marble in adjacent Cardiff in the 1800’s brought to the area an influx of Welsh settlers, whose mining skills easily translated to quarrying. Eventually about 500 workmen were employed in 15 operating slate quarries
That Delta-area slate was judged the best in the world at London’s Crystal Palace Exposition in 1850. It is present today throughout the town in sidewalks, gutters, house foundations, sills and roofs, and local cemeteries have gravestones carved of it. (That slate industry eventually lost its markets with the creation of new roofing materials, and the quarries gradually closed.}"


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