karst window

karst window

[′kärst ‚win·dō]
(geology)
An area over a subterranean stream that is open to the surface and appears as a depression at whose bottom the stream is visible. Also known as karst fenster.
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References in periodicals archive ?
The Leonard Spring Cave section was measured in a large circular karst window with a rubble column formed by the upward collapse of beds from the upper Fredonia beds to the Paoli(Fig.