File:Clastic dikes in the Bishop Tuff (Pleistocene, 760 ka; Sherwin Summit, Owens Valley, California, USA) 1.jpg

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English: Clastic dikes in rhyolitic ash & pumice beds in the Pleistocene of California, USA.

This outcrop consists of a volcanic unit called the Bishop Tuff (it's not really a volcanic tuff, however), a ~760,000 year old rhyolitic pyroclastic flow deposit. It was emplaced during a caldera-forming eruption of the nearby Long Valley Volcano. The base of the unit consists of air-fall rhyolite pumice beds. The overlying layers are pyroclastic flows having ash and pumice.

The protruding, subvertical features in the exposure are clastic dikes - cracks / fissures in the Bishop Tuff got filled in by sediments from above. In general, clastic dikes can also form from the bottom-up.

Locality: Sherwin Summit (= Big Pumice Roadcut) - roadcut along the northern side of Route 395, immediately east of intersection with Lower Rock Creek Road (= Sherwin Grade; = Old Route 395), just east of the “town” of Tom’s Place, Owens Valley, 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@N05/49090963423/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49090963423. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2022

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current23:25, 15 November 2022Thumbnail for version as of 23:25, 15 November 20221,944 × 2,592 (3.68 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49090963423/ with UploadWizard

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