| P number: | P212365 |
|---|---|
| Old photograph number: | A13269 |
| Caption: | Clay weathering profile shown in river cliffs, due south of Shotley Street, London, Suffolk. |
| Description: | Impersistent pale brown ash horizons are seen in weathered London Clay at the bottom part of the section. In the central part is a septarian nodule horizon (casting shadows in the middle right) above which bedding is either faintly seen or is absent because of weathering and cryoturbation. The London Clay is excessively fissured in these upper layers where pockets of ochreous silt are common. Near the top of the face a horizon containing scattered white-coated flint pebbles marks the base of a thin Head deposit. The London Clay Formation is the most widespread and best known of the English Palaeogene (Tertiary) deposits. It is up to 150 metres thick in Essex though thins to 4.6 metres in Wiltshire, its westernmost extent of deposition. It forms an ideal medium for tunnelling. |
| Date taken: | Mon Jan 01 00:00:00 GMT 1979 |
| Photographer: | Evans, H.J. |
| Copyright statement: | NERC |
| X longitude/easting: | 623400 |
| Y latitude/northing: | 234100 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 335.81 KB; 1001 x 667 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Rocks, sedimentary/ Clay |
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