File:Pahoehoe basalt lava (Shoshone Lava Field, lower Holocene, ~10,130 a; near Shoshone, Idaho, USA) 1.jpg

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English: Pahoehoe basalt lava from the Holocene of Idaho, USA.

Southern Idaho’s Snake River Plain represents the track of the Yellowstone Hotspot. Yellowstone is currently located in northwestern Wyoming. In the geologic past, the center of Yellowstone volcanism was in southern Idaho, and before that, it was located in southeastern Oregon.

Eight large, distinctive, dark-colored lava fields cover portions of the modern Snake River Plain: Shoshone Lava Field, Craters of the Moon Lava Field, Wapi Lava Field, Kings Bowl Lava Field, Cerro Grande Lava Field, North Robbers Lava Field, South Robbers Lava Field, and Hell’s Half Acre Lava Field. These lavas erupted during the late Pleistocene and Holocene, well after the Yellowstone Hotspot “migrated” to the northeast. The lavas are so young that little vegetation covers them.

Seen here is a fantastic specimen of pahoehoe basalt lava. When mafic lava erupt, they flow downhill and/or spread out, cool, and solidify. The morphologies of lava flow tops range from aa to pahoehoe, which were originally Hawaiian terms. Aa lava has angular, irregular, sharp-pointed flow tops. Pahoehoe lava (pronounced "pa-hoy-hoy") has smooth or ropy flow tops. The ropes on this sample are well developed.

Geologic unit: Shoshone Lava Field, lower Holocene, ~10,130 a

Locality: undisclosed site somewhere ~north of the town of Shoshone, Lincoln County, ~central Snake River Plain, southern Idaho, USA
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Source https://www.flickr.com/photos/47445767@N05/50623099526/
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@N05/50623099526. It was reviewed on 20 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

20 November 2020

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current15:37, 20 November 2020Thumbnail for version as of 15:37, 20 November 20203,000 × 2,802 (10.29 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50623099526/ with UploadWizard

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