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Uploaded on:
18/02/2009 09:54:06
Type:
Digital Asset
File Size:
344.40 KB
Dimensions:
789 x 1001 pixels
3820 views 5 downloads
P number: P210020
Old photograph number: A10115
Caption: Honeycomb weathering, Budleigh Salterton, Devon.
Description: Trias Sandstone and pebble beds at Budleigh Salterton showing honeycomb weathered Upper Sandstone overlying pebble beds. The latter is a false-bedded sequence 70 to 80 feet thick composed of pebbles and subangular fragments of quartzite, grit and quartz intercalated with dark red and sometimes grey and buff sands. The Upper Sandstone is a group of Triassic coarse current-bedded red sandstones containing a few quartz and quartzite pebbles. In Britain the Triassic consists largely of continental facies. The period forms the beginning of the Mesozoic Era, distinctive for the appearance of many new life forms. Honeycomb weathering is a type of chemical weathering where many small pits are formed on a rock suface by the decomposition of mineral grains. The pits become deeper and coalesce until they join at the surface while remaining joined beneath. The very deeply pitted surface looks like a enlarged honeycomb.
Date taken: 01/01/1963
Photographer: Pulsford, J.M.
Copyright statement: Crown
X longitude/easting: 305500
Y latitude/northing: 80500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Portrait
Size: 344.40 KB; 789 x 1001 pixels; 67 x 85 mm (print at 300 DPI); 209 x 265 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Best of BGS Images/ Geological structures, Geoscience subjects/ Landforms, weathering/ Honeycomb weathering, Geoscience subjects/ Stratigraphical/ Triassic  

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