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Outcrop Ba14-a: The Setters Formation at Avondale Quarry

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Rock Outcrop Ba14-a: The Setters Formation at Avondale Quarry

The Setters Formation is located in southeast Avondale, PA. Huge slabs of rock have been exposed by a gravel company that has been removing the hillside: quarrying for quartzite to sell as building stone and grinding pelitic rock into gravel and stone. These slabs have a foliation with a strike of 45 degrees East of North and a southeastern dip off of the Avondale Anticline. They also display quartzite, schist, and pods of pegmatite, containing large garnets (1-2" in diameter) and schorl tourmaline, that appear to be “sweated out of schist.” A dramatic contrast in rich type-shelf facies reflects beach sand and bogs or inlets.

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Rock Outcrop Ba14-a: The Setters Formation at Avondale Quarry
Rock Outcrop Ba14-a: The Setters Formation at Avondale Quarry
Rock Outcrop Ba14-a: The Setters Formation at Avondale Quarry