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A hole appeared when I was digging a trench for a wall. After clearing the hole I found there to be two very large slabs of stone about 30mm apart. I pushed a tape measure down between the stone slabs and it went down to beyond 7 metres. This was in Herefordshire, England. Can anyone explain what I had found and how was it produced? Kind regards, Steve.

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15y ago
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Q: When digging trench found two slabs of stone with a 30MM gap between them which went down for 7 meters why was this?
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