The York Haven Diabase is a rock formation in Pennsylvania, United States. It underlies the Rossville Diabase and is Jurassic in age.[1] The formation is volcanic to subvolcanic, with a mafic composition and is categorized as a basalt.[1] The York Haven Diabase is a member of the larger Gettysburg Basin.[2] 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.[3]
^ ab"Diabase". USGS. Retrieved 15 March 2021.
^MANGAN, MARGARET T.; MARSH, BRUCE D.; FROELICH, ALBERT J.; GOTTFRIED, DAVID (1993-12-01). "Emplacement and Differentiation of the York Haven Diabase Sheet, Pennsylvania". Journal of Petrology. 34 (6): 1271–1302. doi:10.1093/petrology/34.6.1271. ISSN 0022-3530.
^Brown, Andrew (2006). Geology and the Gettysburg Campaign. US Geological Survey. pp. 9–14.
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The YorkHavenDiabase is a rock formation in Pennsylvania, United States. It underlies the Rossville Diabase and is Jurassic in age. The formation is...
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designated a National Natural Landmark, being "the best example of a thick diabase sill in the United States". It underlies a portion of northwest Staten...
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