Ledges are often left along the edges of sinuous lava tube passages, and are usually somewhat rectangular in cross section, joining walls and floor. Curbs, benches, and shelves are another names commonly applied to these features, which mark the edges of late-stage flows. Ledges may also occur higher on walls and be undercut, leaving catwalk like suspended ledges. These features are more common near entrances since cooling is more rapid in those areas.

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	Created: August 4, 2000 Author: Dave Bunnell