Mt. Holmes Bysmalith

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Section of the Mt. Holmes bysmalith. A bysmalith (also called a volcanic plug, volcanic neck, or lava neck) is a volcanic object created when magma hardens within a vent on an active volcano.


Wyoming, Volcanoes


Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 203


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Large GIF

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Small GIF

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