Palisade Sill on the Hudson River at Alpine, N.J. This 80 kilometer long intrusion forming the western edge of the Hudson River represents less than 0.2 percent of the total volume of magma erupted during the 201-million-year-old Central Atlantic Magmatic Province

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Palisade Sill on the Hudson River at Alpine, N.J. This 80 kilometer long intrusion forming the western edge of the Hudson River represents less than 0.2 percent of the total volume of magma erupted during the 201-million-year-old Central Atlantic Magmatic Province