File:Robinson Mountain Cinder Cone (Pleistocene; San Francisco Volcanic Field, Arizona, USA) (49135502396).jpg
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| Description |
Cinder cone in the Pleistocene of Arizona, USA. This is an inactive cinder cone volcano 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 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. The cinder cone seen here is Pleistocene in age. The excavation at the center of the photo is a cinder pit, now abandoned. On the 1966 O'Leary Peak 1:24,000 topographic quadrangle map, published by the United States Geological Survey, the pit is labeled a "prospect". Scoria is often quarried at various cinder cone volcanoes in western America as a source of lightweight landscaping rocks. Locality: cinder pit on the southern flanks of Robinson Mountain Cinder Cone, 4.2 kilometers west-northwest of Sunset Crater, San Francisco Volcanic Field, Coconino County, north-central Arizona, USA (35˚ 22' 52.78" North latitude, 111˚ 32' 37.41" West longitude) |
| Date | |
| Source | Robinson Mountain Cinder Cone (Pleistocene; San Francisco Volcanic Field, Arizona, USA) |
| 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@N05/49135502396 (archive). It was reviewed on 28 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 | 07:05, 28 November 2019 | | 3,008 × 2,000 (6.2 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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