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Uploaded on:
20/02/2009 11:40:55
Digital Asset
File Size:
218.60 KB
1001 x 757 pixels
1638 views 5 downloads
P number: P218440
Old photograph number: D00841
Caption: Roche moutonnee with glacial striae, Kinlochhourn-Quoich watershed, Invernessshire.
Description: Ice movement is from right to left. The roche moutonnee which has formed by the occurrence of small crags projecting into the path of a glacier. It becomes streamlined, or ice-moulded with the upstream end rounded off and the lee side is made steep by the plucking action of the ice on unsupported blocks. This can be helped when the rock contains vertical joints. In plan the roche moutonnee's outline is a truncated oval. They provide evidence of the direction of movement of the ice. Also indicating direction of ice movement are the glacial striae. Glacial striae are formed because the glacier bottom has frozen-in blocks of rock debris of all sizes. These act as abrasives and scratch and polish the underlying rock floor. Hard rocks retain glacia striae while softer rocks usually lose them through subsequent weathering.
Date taken: 01/01/1967
Photographer: Christie, A.
Copyright statement: NERC
X longitude/easting: 197300
Y latitude/northing: 804600
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Landscape
Size: 218.60 KB; 1001 x 757 pixels; 85 x 64 mm (print at 300 DPI); 265 x 200 mm (screen at 96 DPI);
Average Rating: Not yet rated
Categories: Unsorted Images, Geoscience subjects/ Landforms, glaciation/ Roche mountonne  


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