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Uploaded on:
18/02/2009 09:29:17
Type:
Digital Asset
File Size:
315.95 KB
Dimensions:
1001 x 779 pixels
1656 views 4 downloads
P number: P209965
Old photograph number: A10059
Caption: A Dartmoor granite tor, Blackingstone Rock, Devon.
Description: Blackingstone Rock, a Dartmoor granite tor. Looking east-south-east. A granite tor on the northern margins of the Dartmoor granite. The coarse porphyritic granite is cut by steep joints and also by the markedly curved tabular or sheet joints which are prominent in the picture. It is not certain whether the arched shape of the tor is a product of this curved joint system or whether the curved joints have developed as a result of the shape of the tor. Tors are common on the granite moors of Dartmoor, where rugged grey tors dominate areas of moorland or rough pasture. They are upstanding hill-top masses of rock showing weathered joint blocks. They are formed by deep weathering along the joints followed by subsequent removal of the weathered material, mostly by solifluction. The Dartmoor granite is the largest of five great bosses of ademellitic granite that trend west-south-west from Exeter to Land's End.
Date taken: 01/01/1963
Photographer: Pulsford, J.M.
Copyright statement: Crown
X longitude/easting: 278500
Y latitude/northing: 85500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 315.95 KB; 1001 x 779 pixels; 85 x 66 mm (print at 300 DPI); 265 x 206 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Unsorted Images, Geoscience subjects/ Landforms, weathering/ Tors  

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