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Other types of karst features
Cave. A natural cavity, large enough to be entered, that is connected to subsurface passages in bedrock.
Karst fen. Marsh formed by plants overgrowing a karst lake or seepage area.
Karst pond. Closed depression in a karst area containing standing water.
Mine feature. A man-made shaft, tunnel, cave, hole, or other feature created for mining purposes. This mine feature is a shaft entrance rock pile in Iowa County.
Pavement. Extensive bare areas of exposed bedrock surfaces with many enlarged fractures or sinkhole features.
Spring/seep. Intermittent or permanent seepage of water from ground surface or bedrock outcrop or karst area.