File:Solution tube & vegemorphs ("Palmetto Structure") San Salvador Island.jpg
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DescriptionSolution tube & vegemorphs ("Palmetto Structure") San Salvador Island.jpg |
“Palmetto Structure” at The Bluff, northern Snow Bay, eastern margin of San Salvador Island, eastern Bahamas. Solution tubes are vertically-oriented, subcylindrical, vadose dissolutional features. These structures formed as small scale pathways for conduit flow, likely vegemorphs (plant root traces; a.k.a. rhizocretions or rhizoliths), were dissolutionally enlarged. The conduit linings were sites of calcium carbonate precipitation. At the locality shown above, calcium carbonate cementation has penetrated far into the surrounding limestone bedrock, which is rich in vegemorphs. Differential weathering and erosion resulted in a large, somewhat barrel-shaped structure locally called the “Palmetto Structure”. Stratigraphy: Cockburn Town Member, Grotto Beach Formation, lower Upper Pleistocene |
Date | |
Source | Solution tube & vegemorphs ("Palmetto Structure" at The Bluff, San Salvador Island, Bahamas) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/16257398677. It was reviewed on 8 February 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
8 February 2015
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current | 00:44, 8 February 2015 | 1,280 × 960 (551 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | OLYMPUS OPTICAL CO.,LTD |
Camera model | C900Z,D400Z |
Exposure time | 1/125 sec (0.008) |
F-number | f/10.8 |
ISO speed rating | 100 |
Date and time of data generation | 10:13, 26 March 1999 |
Lens focal length | 9.6 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 10:44, 4 February 2015 |
Y and C positioning | Co-sited |
Exif version | 2.1 |
Date and time of digitizing | 10:13, 26 March 1999 |
Meaning of each component |
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Image compression mode | 1 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Supported Flashpix version | 1 |
Image width | 1,280 px |
Image height | 960 px |
Date metadata was last modified | 05:44, 4 February 2015 |
IIM version | 2 |