A collection of erratic boulders
Introduction
The photograph on this page of A collection of erratic boulders by Jonathan Wilkins as part of the Geograph project.
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A collection of erratic boulders
Image: © Jonathan Wilkins Taken: 25 Mar 2017
Locally-occurring, glacial-erratic boulders have been collected together to make a low rampart adjacent to a low weir structure in the Afon Ogwen. Deep scratches and gouge-marks indicate that they have been moved to their present position by machine, though that presented a significant task as the larger ones are 2-3 metres long and must weigh many tons. Various rock types are represented, but most are of rhyolite and sandstone suggesting an origin high in the Ogwen Valley, from where they were transported in the powerful ice-stream occupying the valley at the last glacial maximum. See also Image
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Image Location
Latitude
53.210246
Longitude
-4.094696