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Uploaded on:
14/02/2009 07:02:45
Digital Asset
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309.41 KB
1000 x 652 pixels
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P number: P007664
Old photograph number: A13450
Caption: Craig-y-cwm, rear wall.
Description: Craig-y-cwm, rear wall. Oolite with differential weathering, Lower Limestone Shale. The oolite near the base of the limestone division of the Lower Limestone Shale is 4.85 m. thick on Craig-y-cwm and typically consists of irregularly-bedded medium to coarse-grained grey oolite with few fossils, parallel and small-scale trough cross-stratification, scattered elongate mudstone clasts and discontinuous crack-like mudstone partings. The hammer head (125 cm. long) rests on the base of a diffuse bed, with wavy bedding formed by anstomosing strings of yellow-brown calcareous sand enclosing oolite pods. The oolite is preferentially dissolved by rainwaters to give the striking honeycomb weathering. A gritty oolite with scattered shell debris occurs at the very base of the photograph and asymmetrical ripple-marks in a thin sandy laminated oolite at the top. The oolite forms a persistent crag around the face of Craig-y-cwm.
Date taken: 01/01/1978
Photographer: Pulsford, J.M.
Copyright statement: NERC
Acknowledgment: This image was digitized with grant-in-aid from JIDI the JISC Image Digitization Initiative
X longitude/easting: 328220
Y latitude/northing: 208840
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 309.41 KB; 1000 x 652 pixels; 85 x 55 mm (print at 300 DPI); 265 x 173 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Unsorted Images, Geoscience subjects/ Landforms, weathering  


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