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This cover includes locations of alkaline ultramafic igneous rocks.The igneous rocks are evidence for Permian extensional reactivationof the faults of continental rifts in the map area. Theigneous rocks are Permian lamprophyres and mica peridotites.


    map background search result map search result map Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Lamprophyre and peridotite intrusions Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Lamprophyre and peridotite intrusions