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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:Zovalex:MV80NTUzNjY2XzgzMDAzMDY1X0I4OTkyRTE4] Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling. Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago. . [/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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