File:Volcanic bomb (basaltic andesite) (Upper Pleistocene, 71 ka; SP Crater cinder cone, Coconino County, Arizona, USA) 9 (30991110630).jpg

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Volcanic bomb from the Pleistocene of Arizona, USA. (bottom view; ~32.5 centimeters across at its widest)

Volcanic bombs are tephra fragments larger than 64 millimeters. They represent blobs of lava erupted into the air during an eruption. While airborne, they often acquire an aerodynamic shape. The bomb shown above has a fusiform shape, formed by spinning around its long axis.

Volcanic bombs are often mafic in composition - this one is composed of basaltic andesite. It formed 71,000 years ago during an eruption from SP Crater, a cinder cone volcano in Arizona. Cinder cones are relatively small, steep-sided volcanoes composed of loose igneous debris, usually vesicular basalt and scoria. They have few eruptions before going extinct - this accounts for their relatively small size. Large volcanoes, such as shields and stratovolcanoes, are long-lived and have numerous eruptions.

Age: Late Pleistocene, 71 ka

Locality: SP Crater (Shit Pot Crater), west of Rt. 89, northern San Francisco Volcanic Field, Coconino County, north-central Arizona, USA

For more info., see: <a href="https://en.wikipedia.org/wiki/Volcanic_bomb" rel="nofollow">en.wikipedia.org/wiki/Volcanic_bomb</a> and

<a href="https://en.wikipedia.org/wiki/S_P_Crater" rel="nofollow">en.wikipedia.org/wiki/S_P_Crater</a>
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Source Volcanic bomb (basaltic andesite) (Upper Pleistocene, 71 ka; SP Crater cinder cone, Coconino County, Arizona, USA) 9
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@N05/30991110630 (archive). It was reviewed on 24 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

24 November 2019

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current10:49, 24 November 2019Thumbnail for version as of 10:49, 24 November 20193,532 × 1,824 (4.3 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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