File:Porphyritic rhyolite (Pleistocene; Yellowstone, Wyoming, USA) (26755758577).jpg

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Porphyritic rhyolite from the Pleistocene of Wyoming, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

This volcanic lava sample comes from the Yellowstone Hotspot Volcano in northwestern Wyoming. It has a porphyritic texture, which refers to crystalline-textured igneous rocks having a mixture of large crystals (phenocrysts) and small crystals (groundmass). The light-colored masses in the rock are feldspar phenocrysts. The medium gray-colored material is the groundmass. Yellowstone has numerous rhyolite lava flows that erupted after an explosive "supervolcanic" eruption ~640,000 years ago.

Locality: unrecorded/undisclosed site in Yellowstone, northwestern Wyoming, USA
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Source Porphyritic rhyolite (Pleistocene; Yellowstone, Wyoming, USA)
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@N05/26755758577 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 October 2019

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Date/TimeThumbnailDimensionsUserComment
current01:50, 10 October 2019Thumbnail for version as of 01:50, 10 October 20192,413 × 1,447 (2.74 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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