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One of the best of the Racetrack I've seen, Bill.
The best collection of rocks I've seen, and they're aligned as though they ARE racing, and you got the light and shadows perfectly, and then topped if off with an excellent composition.
A quick word about the "mystery" of the moving rocks- partly in view of the fact that TV "Nature shows" have lately been doing their best to over-dramatize everything, almost to the point of turning real science into science fiction.
The best experts on the subject pretty much agree that at the high elevation of the racetrack, when winter nights can get well below freezing and extremely high (100mph) winds sometimes blow, AND the top layer of clay is moist and super slippery from recent rains in the surrounding mountains, THAT is when the rocks move. There is also the possibility that ice may sometimes be involved.
It's better said on "Wiki- DV racetrack." Click on the top offering.
The sliding rocks are really cool- for sure .