File:Phenotrachytic welded tuff (Wall Mountain Tuff, Middle Eocene, 36.73 Ma; Teller County, Colorado, USA) 3 (31711817555).jpg
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editDescriptionPhenotrachytic welded tuff (Wall Mountain Tuff, Middle Eocene, 36.73 Ma; Teller County, Colorado, USA) 3 (31711817555).jpg |
Phenotrachytic welded tuff from the Eocene of Teller County, central Colorado, USA. (7.3 cm across at its widest) Volcanic tuff is a fine-grained, clastic-textured, extrusive igneous rock. It forms by lithification of loose volcanic materials produced by an explosive eruption. Some volcanic deposits remain so hot after deposition that they self-lithify - the fragments become "welded" together. Shown above is a welded tuff from the Tertiary of central Colorado. It is composed of fine-grained ash plus some larger grains of pumice, volcanic glass, rock fragments, and various phenocrysts (sanidine feldspar, plagioclase feldspar, biotite mica, clinopyroxene, and hornblende amphibole). Published chemical analysis has shown that this rock is felsic and alkaline (calc-alkaline rhyolitic welded tuff). Petrologically, this makes is a phenotrachytic welded tuff. The source volcano was located near Mt. Princeton in the Sawatch Range, over 50 miles away from the outcrop. Stratigraphy: Wall Mountain Tuff, Upper Eocene, 36.73 Ma |
Date | |
Source | Phenotrachytic welded tuff (Wall Mountain Tuff, Middle Eocene, 36.73 Ma; Teller County, Colorado, USA) 3 |
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@N05/31711817555 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
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current | 02:03, 6 December 2019 | 3,560 × 1,723 (4.63 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 01:47, 17 December 2016 |
Lens focal length | 7.23 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 13.0 (Macintosh) |
File change date and time | 22:09, 17 December 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 01:47, 17 December 2016 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −1 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 17:09, 17 December 2016 |
Unique ID of original document | 433DA11D9EC737FC093301A1775CAD14 |