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Diabase




The New Jersey Palisades of the Hudson River , near New York City , are an example of a diabase sill. The dike complexes of the Hebridean Tertiary volcanic province which includes Skye, Rum, Mull, and Arran of western Scotland , the Slieve Gullion region of Ireland , and extends across northern England contains many examples of diabase dike swarms. Diabase is also called Dolerite in many older references.