Image:Glen Canyon Park Chert Outcrop.jpg
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[edit] Summary
| Description |
Roadcut revealing Franciscan chert rock, Glen Canyon Park, San Francisco, California. This type of chert contains the skeletons of innumerable radiolarian creatures. It is a sedimentary rock, and the visible layering is due to the occasional inclusion of shale layers as the rock was deposited over millions of years.[1] The shale weathers more rapidly than the predominant chert, so the weathered rock looks like a stack. The remarkable folding of the stacked layers indicates the tectonic forces on this rock in this past, which warped the original planar layers into the fantastic shapes they now present. The road in the foreground is O'Shaughnessy Boulevard, which was constructed around 1935.[2] |
|---|---|
| Source |
self-made |
| Date |
April 15, 2007 |
| Author |
Eric A. Schiff |
| Permission (Reusing this image) |
see below |
[edit] References
- ↑ Sloan, Doris (2006). Geology of the San Francisco Bay Region (University of California Press). ISBN 978-0520241268.
- ↑ San Francisco Recreation and Parks Department, "Significant Natural Resources Areas Management Plan," section 6.3 "Glen Canyon Park and O’Shaughnessy Hollow," (Final Draft Plan, February, 2006). This section contains several detailed maps on "Soils, Land Features, and Trails," "Vegetation," and "Sensitive Species and Bird Habitat." Retrieved February 3, 2007.
[edit] Licensing
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This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license
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File history
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 04:05, 16 April 2007 | 2,504×2,008 (2.17 MB) | Easchiff | ({{Information |Description=Outcrop of Franciscan chert rock, Glen Canyon Park, San Francisco, California. |Source=self-made |Date=April 15, 2007 |Author= Eric A. Schiff |other_versions= }}) |
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Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
| Camera manufacturer | Canon |
|---|---|
| Camera model | Canon PowerShot SD630 |
| Exposure time | 1/1250 sec (0.0008) |
| F-number | f/2.8 |
| Date and time of data generation | 13:51, 15 April 2007 |
| Lens focal length | 5.8 mm |
| Image title | Franciscan Chert Outcrop, Glen Canyon Park, San Francisco, California |
| Orientation | Normal |
| Horizontal resolution | 180 dpi |
| Vertical resolution | 180 dpi |
| Software used | ACD Systems Digital Imaging |
| File change date and time | 21:03, 15 April 2007 |
| Author | Eric A. Schiff |
| Y and C positioning | 1 |
| Copyright holder | Eric A. Schiff |
| Exif version | 2.2 |
| Date and time of digitizing | 13:51, 15 April 2007 |
| Image compression mode | 5 |
| Shutter speed | 10.28125 |
| Aperture | 2.96875 |
| Exposure bias | 0 |
| Maximum land aperture | 2.96875 |
| Metering mode | Pattern |
| Flash | 16 |
| DateTime subseconds | 906 |
| Color space | sRGB |
| Focal plane X resolution | 12515.555555556 |
| Focal plane Y resolution | 12497.041420118 |
| Focal plane resolution unit | inches |
| Sensing method | One-chip color area sensor |
| Custom image processing | Normal process |
| Exposure mode | Auto exposure |
| White balance | Auto white balance |
| Digital zoom ratio | 1 |
| Scene capture type | Standard |
