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Uploaded on:
14/02/2009 07:09:59
Digital Asset
File Size:
283.47 KB
672 x 1000 pixels
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P number: P007686
Old photograph number: A13472
Caption: East Pentwyn, near Blaina.
Description: East Pentwyn, near Blaina. Debris flow and back scar of typical 'Pennant' landslip, Blaina. The jumbled mass of large 'Pennant' sandstone blocks on the surface of a large debris flow, 'A', is generated downslope of the back scar of the East Pentwyn slump earth-flow. The debris flow averages 15 m. in thickness and is moving slowly downslope above a lubricated sole. The initial landslip was probably largely translational with little rotational movement. In the back scar, some 15 m. of dark stained 'Pennant' sandstone overlies a thin coal smut, the Cefn Glas, 'B', marking the base of the Hughes Beds. The Brithdir Coal, 'C', at the base of the Brithdir Beds is overlain by 4 m. rusty weathering mudstones, 'D', the 50 m. sandstone crags, 'E', and the 8 m. mudstones, shales and seat-earths, 'F', beneath the Cefn Glas. A discontinuous cover of sandy head, averaging 1 m. overlies the in situ rock. The landslip occurred in 1954.
Date taken: 01/01/1978
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: 320600
Y latitude/northing: 207500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Portrait
Size: 283.47 KB; 672 x 1000 pixels; 57 x 85 mm (print at 300 DPI); 178 x 265 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Unsorted Images, Geoscience subjects/ Landforms, weathering/ Landslips  


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