SH7682 : Erratic boulder

taken 4 years ago, near to Gogarth, Conwy, Great Britain

Erratic boulder
Erratic boulder
Great interest attaches to the large, isolated boulders found high on the plateau of Great Orme's Head. If they are truly erratic, then ice of sensible thickness must have covered the top of the headland, whose height is more than 200m above present sea level. During the last glacial maximum, sea level was depressed by up to 150m, which increases the logical ice thickness required to deposit debris near the summit. As this boulder is of highly weathered, rubbly Carboniferous Limestone, it is potentially of very local origin. Local limestones are indistinguishable from those with outcrops in the upstream direction of ice flow, so the matter is not clear-cut.
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SH7682, 126 images   (more nearby )
Photographer
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Date Taken
Thursday, 17 October, 2013   (more nearby)
Submitted
Thursday, 17 October, 2013
Geographical Context
Geological interest  Uplands  Grassland  Rocks, Scree, Cliffs 
Subject Location
OSGB36: geotagged! SH 7686 8291 [10m precision]
WGS84: 53:19.7240N 3:51.0277W
Camera Location
OSGB36: geotagged! SH 7686 8291
View Direction
East-northeast (about 67 degrees)
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Image classification(about): Geograph
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