File:Pumice (Holocene, ~7550-7760 a; Route 138 ditch cut, Klamath County, Oregon, USA).jpg
Original file (2,946 × 2,566 pixels, file size: 5.17 MB, MIME type: image/jpeg)
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Summary
| Description |
English: Pumice from the Holocene of Oregon, USA.
Crater Lake is a large, deep, freshwater lake in the Cascade Range of America's Pacific Northwest. It formed about 7,700 years ago when an ancient volcano called Mt. Mazama had an enormous explosive ash eruption. The eruption was followed by collapse of the mountain, leaving a large depression which later filled with water. Large holes or depressions formed when a volcano destroys itself or collapses are called calderas. Crater Lake Caldera in Oregon is a world-class example of this type of volcanic feature. Seen here is a rhyodacitic pumice sample from a ditch cut outside of Crater Lake park. It was deposited by a pyroclastic flow during Mazama's 7.7 ka eruption. Age: early Holocene (~7550 to 7760 years ago) Locality: ditch cut along Route 138, northwestern Klamath County, southwestern Oregon, USA (43° 05.337’ North latitude, 122° 01.680' West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50708679268/ |
| 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@N05/50708679268. It was reviewed on 14 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:37, 14 December 2020 | | 2,946 × 2,566 (5.17 MB) | wikimediacommons>Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50708679268/ with UploadWizard |
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