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Summary
| Description |
English: Photomicrograph showing detail of the varves in the rich oil shale specimen in Bradley photo 321; the organic laminae indicated by marks are themselves finely laminated. The mineral laminae contain considerable organic matter, but they are readily distinguished by their coarser grain and greater thickness. Enlarged 320 diameters. Garfield County, Colorado. 1927. |
| Date | |
| Source |
Plate14-A in U.S. Geological Survey. Professional paper 158. 1930. Image file: http://libraryphoto.cr.usgs.gov/htmllib/btch271/btch271j/btch271z/btch271/bwh00323.jpg |
| Author | U.S. Geological Survey |
Licensing
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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Original upload log
The original description page was here. All following user names refer to en.wikipedia.
| Date/Time | Dimensions | User | Comment |
|---|---|---|---|
| 2008-05-12 05:46 | 1400×1053× (788460 bytes) | Tillman | Photomicrograph showing detail of the varves in the rich oil shale specimen in Bradley photo 321; the organic laminae indicated by marks are themselves finely laminated. The mineral laminae contain considerable organic matter, but they are readily disting |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:39, 17 August 2015 | | 1,400 × 1,053 (770 KB) | Innotata | Transferred from en.wikipedia |
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