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geology question: is there a term for these sort of incision marks on river cobbles?
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Thomas Cruciamen |
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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.
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Quoting: Zovalex The cracks, provided that the stones are fused, would have been the result of the shockwave ripping through them primarily. The welding, if you will, would have happened in the microseconds immediately following that wave. Seconds later the melt water pulse would have charged into the cavity and started massive subglacial flooding that would have melted still more ice. There are vast boulder fields in the Blue Ridge mountains that I think are likely a result of this same event. Though, it would seem that the shocked cobble is not found that far south.
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