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Unless otherwise stated, this image is the copyright of the submitter. Contact them for permission to reproduce it. |  | | Description | Photo of the Pierre du Diable dolmen capstone.
A great number of cups are engraved and certainly some were made by prehistoric men.
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| Posted Comments: tashi
(2007-06-08) | Some of those cups may be man-made but this sort of "swiss-cheese" limestone is found everywhere in Dordogne limestone -- especially in boulders or smaller rocks (as opposed to cliffs or bedrock). It's a natural pattern of erosion, apparently. When the holes fill up with dissolved silicates underground, they form flint nodules. If the stone is high enough above the water table and then erodes from cliffs into boulders, this is what you see -- cavities, unfilled. |
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