Where in the United States is there evidence of volcanism?
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USGS Frequently Asked Questions
Question:
Where in the United States is there evidence of volcanism?
Answer:
Though few people in the United States may actually experience an erupting
volcano, the evidence for earlier volcanism is preserved in many rocks of North
America. Features seen in volcanic rocks only hours old are also present in
ancient volcanic rocks, both at the surface and buried beneath younger deposits.
A thick ash deposit sandwiched between layers of sandstone in Nebraska, the
massive granite peaks of the Sierra Nevada mountain range, and a variety of
volcanic layers found in eastern Maine are but a few of the striking clues of
past volcanism.
-- From: Brantley, 1994, Volcanoes of the United States: USGS General
Interest Publication.
