: These are typically formed by underground streams that erode downward through bedrock (often limestone). This process creates passages that are taller than they are wide , resembling narrow surface canyons with a cave ceiling. Characteristics :
: Technical reports from the National Speleological Society detail accidents occurring within these specific cave structures. How Mammoth Cave Formed - National Park Service
as Hi Linnet (who also composed the Oscar-nominated song "Ole Buttermilk Sky" for the film).
: Because of their vertical nature, they often require "chimneying" (bracing against opposite walls) to traverse.
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