File:Thrombolite-stromatolite (1.9 m diameter) VMNH.jpg
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Summary
[edit]DescriptionThrombolite-stromatolite (1.9 m diameter) VMNH.jpg |
Huge thrombolite-stromatolite mass from the Cambrian of Virginia. This remarkable specimen is a >2 ton, 1.9 meter long-axis diameter thrombolite bioherm on public display at the Virginia Museum of Natural History (Martinsville, Virginia, USA). It has a thrombolite core with a pustulose stromatolitic outer layer. It was collected in June 2008. Stratigraphy: Conococheague Formation, Upper Cambrian. Locality: Boxley Materials Blue Ridge Quarry, Bedford County, Virginia, USA. Stromatolites are large, layered structures built up by mats of cyanobacteria. Stromatolites vary in appearance, ranging from slightly wrinkled horizontal laminations in sedimentary rocks to low mounds to prominent mounds to columnar structures and other forms. Stromatolites are most common in the Proterozoic fossil record. They are scarce today, but famous modern examples occur at Shark Bay, Western Australia. |
Date | |
Source | Thrombolite-stromatolite (1.9 m diameter) (Conococheague Formation, Upper Cambrian; Boxley Materials Blue Ridge Quarry, Bedford County, Virginia, USA) 3 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15202233345. It was reviewed on 11 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 September 2014
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current | 02:57, 11 September 2014 | 3,534 × 2,307 (3.5 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Date and time of data generation | 17:51, 9 November 2012 |
Lens focal length | 21 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
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Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 15:18, 10 September 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 17:51, 9 November 2012 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 3.8 APEX (f/3.73) |
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Image width | 3,534 px |
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Date metadata was last modified | 11:18, 10 September 2014 |