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Mount Mazama ash 6.6 thousand years ago

View on map:47.308782°N 120.041352°W

Comments

"As you drive NE along Palisades Rd at the bottom of giant 600ft tall Moses Coulee (which was primarily formed from 5 earlier Late WIsconsinan floods around 28-25kya before the glacial maximum), keep an eye on the coulee walls at your left/west from abou this point on. There will be a few opportunities to see 7700 year old Mount Mazama volcanic ash (now Crater Lake Caldera in Oregon)....The Mt Mazama tephra exposures here will be a roughly 1 ft thick layer of white ash exposed along the steep talus slopes of basalt gravel." (see the reference).

Description


Crater Lake fills the caldera of Mount Mazama
Mount Mazama (Giiwas in the Native American language Klamath) is a complex volcano in the state of Oregon, United States, in a segment of the Cascade Volcanic Arc and Cascade Range. Most of the mountain collapsed following a major eruption approximately 7,700 years ago. The volcano is in Klamath County, in the southern Cascades, 60 miles (97 km) north of the Oregon-California border. Its collapse formed a caldera that holds Crater Lake. The mountain is in Crater Lake National Park. Mount Mazama originally had an elevation of 12,000 feet (3,700 m), but following its climactic eruption this was reduced to 8,157 feet (2,486 m). Crater Lake is 1,943 feet (592 m) deep, the deepest freshwater body in the US and the second deepest in North America after Great Slave Lake in Canada.

References

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