File:Folded strata below Allt Wen - geograph.org.uk - 1750056.jpg
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[edit]DescriptionFolded strata below Allt Wen - geograph.org.uk - 1750056.jpg |
English: Folded strata below Allt Wen This close-up shows a cross section of the folded strata exposed on the wave-cut platform below the cliffs of Allt Wen. The dark gray material is grainier and more brittle than the light grey sediment it alternates with. The width of the pictured area is about 25cm.
Allt Wen, the northern end of the coastal cliff south of Aberystwyth, is a remarkable geological site. A number of micro-folds only a few metres across with nearly parallel vertical limbs have been exposed on a wave-cut platform at the base of the cliff. The exact sequence of events that have taken place here is still debated, but it is thought that during the Caledonian orogeny 400Ma ago, freshly deposited layers of sediment became pressurised and folded before they were fully lithified and thus more deformable. There are also quartz veins parallel with the bedding in some places. It is thought that they were pressed into the fresh sediment before the folding took place. For more details, see the Geological Conservation Review's site report http://www.thegcr.org.uk/Sites/GCR_v03_C04_Site2318.htm . |
Date | |
Source | From geograph.org.uk |
Author | Rudi Winter |
Attribution (required by the license) InfoField | Rudi Winter / Folded strata below Allt Wen / |
InfoField | Rudi Winter / Folded strata below Allt Wen |
Camera location | 52° 23′ 40″ N, 4° 05′ 42″ W ![]() ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Object location | 52° 23′ 40″ N, 4° 05′ 42″ W ![]() ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Rudi Winter and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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Attribution: Rudi Winter
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:51, 5 March 2011 | ![]() | 768 × 1,024 (454 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Folded strata below Allt Wen This close-up shows a cross section of the folded strata exposed on the wave-cut platform below the cliffs of Allt Wen. The dark gray material is grainier and more brit |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot S70 |
Exposure time | 1/20 sec (0.05) |
F-number | f/2.8 |
Date and time of data generation | 18:59, 7 March 2010 |
Lens focal length | 5.8125 mm |
Orientation | Normal |
Vertical resolution | 180 dpi |
File change date and time | 18:59, 7 March 2010 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 18:59, 7 March 2010 |
Image compression mode | 5 |
APEX shutter speed | 4.3125 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Center weighted average |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 10,816.901408451 |
Focal plane Y resolution | 10,816.901408451 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
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7 March 2010
52°23'40.2"N, 4°5'42.0"W
52°23'40.2"N, 4°5'42.0"W
0.05 second
2.8
5.8125 millimetre
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