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geology question: is there a term for these sort of incision marks on river cobbles?
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Poster Handle
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Thomas Cruciamen |
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Post Content
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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 very interesting. arizona is a bit removed from eastern canada as far as the glacial epochs go, from what i understand. perhaps any link(s) between the two do indeed go further back or beyond any relatively recent surfacd events? hmm When considering the exceptionally massive flooding from an ice sheet struck multiple times scenario something like that could have easily been carried by the water. It was shocked, thus fused into its position by the heat generated in the tiny fraction of a second and swept away soon after. I think it scoured the central U.S. from Gulf coast to the Great Lakes. The Lake Missoula floods I believe were part of the same event. Sverdrup; "..oceanography, a sverdrup is a non-SI metric unit of flow, with 1 Sv equal to 1 million cubic metres per second; it is equivalent to the SI derived unit cubic hectometer per second. It is used almost exclusively in oceanography to measure the volumetric rate of transport of ocean currents" That said, a formation such as what was mentioned earlier could easily be a seperate incident too.
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