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I don't know if anyone is still interested in this question, but I am doing research on Uluru (a.k.a Ayers Rock), Australia, and the Mitten Ridge Sinkhole in Sedona, AZ (A very interesting combination of locations.). I have a photo just outside the sinkhole showing the sidewall of the Supai Sandstone. The sandstone is pitted just like honey-comb tafoni. ...

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