File:Scoria tephra deposit from Sunset Crater (late 11th century A.D. eruption) (San Francisco Volcanic Field, Arizona, USA) 1 (49120044841).jpg
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Summary[edit]
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| Description |
Scoria in the Holocene of Arizona, USA. This is a scoria deposit erupted from Sunset Crater, a cinder cone in Arizona's San Francisco Volcanic Field. Cinder cones are relatively small, steep-sided cones of loose igneous debris. They have few eruptions and a relatively large summit crater. Cinder cones are principally composed of scoria and vesicular basalt. More than 600 eruptive centers - mostly cinder cones - are present in the volcanic field, and date from the Late Miocene to the late Holocene. The largest volcano in the area is San Francisco Mountain, an eroded stratovolcano. Cinder cones in the field have erupted a variety of igneous products, ranging from mafic to felsic to alkaline in composition - most are alkaline basalt. Sunset Crater had an eruption in the late 11th century A.D., variously dated to 1064 and in the 1080s. The eruption involved lava flows and relatively widespread deposition of airfall scoria and ash. This was the most recent activity in the entire San Francisco Volcanic Field. Near Sunset Crater, about 1.2 meters of material was deposited. In distal areas, the scoria/ash deposit is 10 centimeters thick. Locality: Sunset Crater National Monument, San Francisco Volcanic Field, Coconino County, north-central Arizona, USA |
| Date | |
| Source | Scoria tephra deposit from Sunset Crater (late 11th century A.D. eruption) (San Francisco Volcanic Field, Arizona, USA) 1 |
| 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@N05/49120044841 (archive). It was reviewed on 26 November 2019 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 | 04:18, 26 November 2019 | | 3,008 × 2,000 (5.87 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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