File:Pahoehoe basalt lava (Shoshone Lava Field, lower Holocene, ~10,130 a; near Shoshone, Idaho, USA) 1.jpg
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[edit]DescriptionPahoehoe basalt lava (Shoshone Lava Field, lower Holocene, ~10,130 a; near Shoshone, Idaho, USA) 1.jpg |
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 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50623099526/ |
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@N05/50623099526. 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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current | 15:37, 20 November 2020 | 3,000 × 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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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/20 sec (0.05) |
F-number | f/3.2 |
ISO speed rating | 320 |
Date and time of data generation | 21:31, 19 November 2020 |
Lens focal length | 8.295 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 22:41, 19 November 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:31, 19 November 2020 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 4.3125 |
APEX aperture | 3.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 17:41, 19 November 2020 |
Unique ID of original document | 6CF73E213F911601ED8FD0176A2F4E0F |