File:Silver-replaced gastropod in fossiliferous limestone, Smuggler Mine, Aspen, Colorado.jpeg
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Summary
DescriptionSilver-replaced gastropod in fossiliferous limestone, Smuggler Mine, Aspen, Colorado.jpeg |
Silver-replaced fossiliferous limestone from Colorado, USA. (DMNH 138, Denver Museum of Nature & Science, Denver, Colorado, USA) This remarkable rock is fossiliferous limestone that has been replaced by native silver (Ag). The large, whitish fossil near the center is a gastropod (snail). This comes from a famous silver mining area in Colorado - the Aspen Mining District. Barite, various sulfides and sulfosalt minerals, plus native silver occur principally in breccia zones in the Aspen District. The breccia zones occur within and at the top of the Leadville Limestone, a Lower Mississippian unit that includes dolostone and limestone. Silver and sulfide mineralization in the area occurred during the Late Cretaceous and Paleocene, between approximately 70 and 55 million years ago. This mineralization accompanied the Laramide Orogeny, a mountain building event that formed the true Rocky Mountains of New Mexico, Colorado, Wyoming, and Montana. Locality: Smuggler Mine, Smuggler Mountain, Aspen Mining District, central Pitkin County, west-central Colorado, USA Example references on Smuggler Mine area geology: Bryant (1979) - Geology of the Aspen 15-minute quadrangle, Pitkin and Gunnison Counties, Colorado. United States Geological Survey Professional Paper 1073. 146 pp. Stegen et al. (1990) - The origin of the Ag-Pb-Zn-Ba deposits at Aspen, Colorado, based on geologic and geochemical studies of the Smuggler Orebody. Economic Geology Monograph 7: 266-300. |
Date | |
Source | Silver-replaced gastropod in fossiliferous limestone (Leadville Limestone, Lower Mississippian; mineralization between 70 and 55 Ma; Smuggler Mine, Aspen, Colorado, USA) 2 |
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@N05/24282644151. It was reviewed on 18 January 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
18 January 2016
Items portrayed in this file
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26 October 2013
0.025 second
4.9
18 millimetre
800
image/jpeg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 08:50, 18 January 2016 | 3,803 × 2,704 (6.07 MB) | Tillman | Transferred from Flickr via Flickr2Commons |
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Camera model | TG-1 |
Exposure time | 1/40 sec (0.025) |
F-number | f/4.9 |
ISO speed rating | 800 |
Date and time of data generation | 13:46, 26 October 2013 |
Lens focal length | 18 mm |
Latitude | 0° 0′ 0″ N |
Longitude | 0° 0′ 0″ E |
Orientation | Normal |
Horizontal resolution | 314 dpi |
Vertical resolution | 314 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:45, 13 January 2016 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 13:46, 26 October 2013 |
Meaning of each component |
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Exposure bias | −1.3 |
Maximum land aperture | 2 APEX (f/2) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1.6 |
Focal length in 35 mm film | 100 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Receiver status | Measurement interoperability |
Reference for direction of image | Magnetic direction |
Direction of image | 74 |
GPS tag version | 0.0.3.2 |
Supported Flashpix version | 1 |
Image width | 3,936 px |
Image height | 2,704 px |
Date metadata was last modified | 14:45, 13 January 2016 |
IIM version | 2 |