Sure sounds man-made.
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Cave Collapse, probably. This area of the state has lots of dolomite bedrock, and is known for karst formation. Here's ...
- Ooops...I was wrong...a closer look at the geology map of the state, and local reporting, the bedrock in the area ...
- And another geological formation is gone. Normally I wouldn't care (these things happen all the time naturally), but personally, ...