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It's clearly water doing it, but I don't understand why the water eroded straight down instead of making a more horizontal cavern with stalactites and stalagmites. Those caverns are in limestone too.
It's so perfectly straight in the photos and we all know that water almost never goes perfectly straight. It winds and meanders all over the place following the path of least resistance.
Barefoot's karst topography link makes a lot of sense the way it's drawn, but I'm not fully convinced. This shaft reminds me of peeing into a snow bank. Dogs, I mean, not me. You would never catch me peeing into a snowbank.
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