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File:Rhyolitic pumice (Bishop Tuff, Pleistocene, 760 ka; Sherwin Summit outcrop, Mono County, California, USA) 2.jpg

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English: Rhyolitic pumice floating in water from the Pleistocene of California, USA.

Pumice is a frothy-textured, extrusive igneous rock having felsic to intermediate to alkaline chemistry. It is lightweight for its size and many samples will float in water. Colors range from whitish to various shades of light gray, tan, and grayish-brown. The samples seen here are weathered rhyolitic pumice (= felsic chemistry) from an air-fall deposit formed by a caldera-forming explosive eruption in California. The source is the Long Valley Volcano, which had an enormous eruption during the Pleistocene, about 760,000 years ago. The Long Valley Volcano is located northeast of the town of Mammoth Lakes, California.

Stratigraphy: Bishop Tuff, Pleistocene, 760 ka

Locality: loose pieces from Sherwin Summit outcrop (also known as Big Pumice Roadcut), along the northern side of Route 395, immediately east of the Route 395-Lower Rock Creek Road intersection, east of the "town" of Tom's Place, Mono County, eastern California, USA (37° 33' 28.80" North latitude, 118° 39' 26.23" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/51498372965/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51498372965. It was reviewed on 12 October 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 October 2021

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current18:03, 12 October 2021Thumbnail for version as of 18:03, 12 October 20212,885 × 1,566 (2.15 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51498372965/ with UploadWizard

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