| P number: | P212488 |
|---|---|
| Old photograph number: | A13392 |
| Caption: | Solution of Chalk along fault, Shoreham Cement Works Quarry, West Sussex. |
| Description: | Solution of Upper Chalk on the hanging wall side of a minor fault of very small throw has produced a characterisitic pattern of dendritic cavities. These cavities, which are typically empty except for a little chalk and flint rubble cemented by calcite, generally have a thin lining of crystalline calcite. Elsewhere in the quarry similar though larger cavities have been found to contain well-developed stalactites and stalagmites - rare features in the Chalk but common in many other limestones such as in caves in Carboniferous Limestone. Chalk is a porous rock though because of the very fine pores and their interconnections the matrix permeability and thus the speed at which water flows through the rock is slow. Water in the Chalk aquifer under central London has been dated at 20,000 years old. Chalk has good secondary porosity due to joints fissures and faults that can provide rapid transport of groundwater. |
| Date taken: | Mon Jan 01 00:00:00 GMT 1979 |
| Photographer: | Jeffery, C.J. |
| Copyright statement: | NERC |
| X longitude/easting: | 520870 |
| Y latitude/northing: | 109090 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 312.32 KB; 1000 x 664 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/ Structural features/ Fault breccia |
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