It's hard to sense just how hot the core of the earth is and what it is like where two tectonic plates meet, one subducting below the other. The heat so intense that rock melts and swirls into patterns such as we see here and in the rocks I posted yesterday.
At one time I could have photographed this from close up but after a few accidents the potholes have been fenced off from above so I had to shoot this with the 100-400 doubled for framing. But that resulted in a reasonably sharp image throughout where closer would have required either stacking or a tilt/shift lens which I don't own. This was the more interesting of the abstract patterns but there are many to choose from.
The potholes are created over time. At first by the motion of the water flowing over the surface of the rock bed removing the softer areas and loose grain until a depression is formed. A rock, or in this case two, gets settled into the depression and the continuing flowing motion over an eon or two wears away more stone until a hole is formed, permanently capturing the rock, water swirling it around the hole, and enlarging it.
The area is called the Glacial Potholes but, as one geologist pointed out, they are actually "post-glacial" since they were not formed until after the glacier had receded.
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