SO2014 : Patterned ground

taken 16 years ago, near to Blackrock, Monmouthshire/Sir Fynwy, Great Britain

Patterned ground
Patterned ground
The plateau ground to the west of Mynydd Pen Cyrn is scattered with gritstone boulders arranged in a pattern of polygons. This is a relict feature of arctic conditions which prevailed in this location at the end of the last glacial period (about 10,000 years ago), and was caused by frost shattering of the underlying rock and subsequent upheaving under cycles of ground freeze/thaw. The technical term for the arctic conditions is periglacial and the patterned ground is a periglacial feature.
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SO2014, 11 images   (more nearby search)
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Date Taken
Sunday, 13 November, 2005   (more nearby)
Thursday, 9 November, 2006
Geological feature   (more nearby)
Subject Location
OSGB36: geotagged! SO 20 14 [1000m precision]
WGS84: 51:49.4066N 3:9.2937W
View Direction
WEST (about 270 degrees)
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Image classification(about): Geograph (Second Visitor for SO2014)
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