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geology question: is there a term for these sort of incision marks on river cobbles?
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[quote:Thomas Cruciamen:MV80NTUzNjY2XzgzMDMwMDMwX0UwOTFGQkVD] The same shock wave, if the piles of stones are fused into the arrangement you saw, would have been responsible for this as well. [/quote]
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these seem to be somewhat ubiquitous in these parts despite their otherwise varying mineral compositions and general shapes:
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anyone with a hint?
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