File:Nez Perce Creek Flow (Middle Pleistocene, ~152 ka; Firehole Canyon roadcut, Yellowstone, Wyoming, USA) 12.jpg
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Summary
[edit]DescriptionNez Perce Creek Flow (Middle Pleistocene, ~152 ka; Firehole Canyon roadcut, Yellowstone, Wyoming, USA) 12.jpg |
English: Rhyolite in the Pleistocene of Wyoming, USA.
Gray = rhyolite Blackish = rhyolitic vitrophyre Reddish-brown = rhyolitic mahogany vitrophyre Rhyolite is a felsic, aphanitic, extrusive igneous rock - it's one of many specific types of lava produced by volcanoes. Rhyolite is generally light-colored and finely-crystalline. When molten, it almost always has a high viscosity - it is thick and sticky, almost like toothpaste. Sometimes, rhyolitic lava cools into glass (obsidian) or glass with scattered crystals (vitrophyre). Some explosive volcanic eruptions consist of rhyolite ash, which is finely-pulverized rock, or rhyolitic pumice, which is light-weight and frothy-textured, with numerous tiny holes that were originally gas bubbles. Seen here is a Pleistocene-aged, rhyolite lava flow in Yellowstone, Wyoming. Yellowstone is a hotspot volcano that has occasional enormous explosive ash eruptions. After the last one, about 640,000 years ago, smaller-scale volcanism has occurred at Yellowstone - some involving dark-colored basaltic lava flows and some involving light-colored rhyolitic lava flows. This example is the Nez Perce Creek Flow, which consists of rhyolites dating to about 152,000 years ago. Stratigraphy: Nez Perce Creek Flow, Central Plateau Member, Plateau Rhyolite, upper Middle Pleistocene, ~152 ka (dates range from 148 to 160 ka) Locality: roadcut on the eastern side of Firehole Canyon Drive, Yellowstone, northwestern Wyoming, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/53041388422/ |
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@N05/53041388422. It was reviewed on 13 July 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 July 2023
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current | 17:37, 13 July 2023 | 4,000 × 3,000 (9.86 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53041388422/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/80 sec (0.0125) |
F-number | f/4.9 |
ISO speed rating | 80 |
Date and time of data generation | 14:03, 14 June 2023 |
Lens focal length | 18.6 mm |
Width | 4,000 px |
Height | 3,000 px |
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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 | 00:28, 12 July 2023 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 14:03, 14 June 2023 |
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APEX shutter speed | 6.3125 |
APEX aperture | 4.59375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4.59375 APEX (f/4.91) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
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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 | Landscape |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 20:28, 11 July 2023 |
Unique ID of original document | 29E4EC5A9DE942DAECD31C13BFE78EC6 |
IIM version | 18,755 |