File:Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 9 (49092975402).jpg
Original file (3,008 × 2,000 pixels, file size: 5.37 MB, MIME type: image/jpeg)
Captions
Captions
Summary edit
_9_(49092975402).jpg&action=edit§ion=1){kind=link}
| Description |
Volcanic tuff in the Pliocene of California, USA. Volcanic tuff is a clastic-textured, fine-grained, well to moderately well sorted, extrusive igneous rock. It has grains all about the same size. This rock forms by deposition, burial, and lithification of ash expelled during explosive volcanic eruptions. Some of the volcanic tuff at this site has scattered larger, angular grains, but I don't know what the cutoff point is between a volcanic tuff (= all ash) and volcanic breccia (= lots of large angular grains). The outcrop seen here is at California's Calistoga Petrified Forest, which has been called the best-anywhere fossil forest of Pliocene age. Fossil wood at this site is preserved with the most common permineralization mineral - quartz. The preservation of these trees was the result of burial by a rhyolitic pyroclastic flow deposit of the Sonoma Volcanics (Upper Pliocene). The ash and rock fragments were erupted from a vent near modern-day Mt. St. Helena (= north of this locality). Stratigraphy: Sonoma Volcanics, Upper Pliocene, 3.2 to 3.4 Ma Locality: Calistoga Petrified Forest, northern side of Petrified Forest Road, west-southwest of the town Calistoga, eastern Sonoma County, Coast Ranges of northwest-central California, USA |
| Date | |
| Source | Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 9 |
| Author | James St. John |
Licensing edit
_9_(49092975402).jpg&action=edit§ion=2){kind=link}
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49092975402 (archive). It was reviewed on 20 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:37, 20 November 2019 | | 3,008 × 2,000 (5.37 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
_9_(49092975402).jpg&oldid=642442429){kind=link}