Magmatic intrusions are prerequisites to volcanism 1. Intrusions assemble into magma reservoirs 2, which underpin the fixity and growth of volcanic edifices. If and when magma reaches a volcanic vent ...
Object Details Summary A laccolith, an igneous rock intrusion exposed at surface by weathering away of sedimentary rock cover. Cite as Smithsonian Institution Archives, Record Unit 7177, Image No.
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