Recent Examples of tephra from the Web
Some 630,000 years ago, the supervolcano beneath Yellowstone National Park in Wyoming recorded its last catastrophic eruption, forming a caldera that nearly spans the park’s width and belching a thick layer of ash, or tephra, across North America.
Understanding tephra is usually harder than finding it.
That volcano last erupted in 1985 producing lava flows with minor tephra.
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Learn More about tephra
Britannica.com: Encyclopedia article about tephra
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