| 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: | Sun Jan 01 00:00:00 GMT 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 |
Loading...
Loading...
Reviews
There is currently no feedback