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08:48 AM
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Subject
geology question: is there a term for these sort of incision marks on river cobbles?
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[quote:Thomas Cruciamen:MV80NTUzNjY2XzgzMDMwMDcxX0YzRkEwRTdF] That is IF they were carried that far. Which, seems more and more unlikely the more I look. But, our planet has been struck plenty of times for those to be from an entirely separate event to say the least. [/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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