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About: York Haven Diabase     Goto   Sponge   NotDistinct   Permalink

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The York Haven Diabase is a rock formation in Pennsylvania, United States. It underlies the Rossville Diabase and is Jurassic in age. The formation is volcanic to subvolcanic, with a mafic composition and is categorized as a basalt. The York Haven Diabase is a member of the larger Gettysburg Basin. It plays an important role in United States history as the diabase outcrops were useful barriers in the union's strategy against the confederates at the Battle of Gettysburg.