File:O'Leary Peak (San Francisco Volcanic Field, Arizona, USA) 2 (49134837852).jpg

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Volcanic dome in the Pleistocene of Arizona, USA.

This hill is an inactive volcano in Arizona's San Francisco Volcanic Field. 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.

Despite it looking like a cinder cone volcano, O'Leary Peak is actually a volcanic dome. It is reportedly composed of Pleistocene-aged porphyritic rhyodacite.

Locality: O'Leary Peak (looking ~east from Route 89), northwest of Sunset Crater National Monument, San Francisco Volcanic Field, Coconino County, north-central Arizona, USA
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Source O'Leary Peak (San Francisco Volcanic Field, Arizona, USA) 2
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49134837852 (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.

28 November 2019

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Date/TimeThumbnailDimensionsUserComment
current07:04, 28 November 2019Thumbnail for version as of 07:04, 28 November 20193,003 × 1,569 (4.75 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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