SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Limestone pavement ridge. The ridge of a limestone pavement with a growth of the Hart's Tongue fern (Asplenium scolopendrium). Limestone pavements are flat exposures of bare limestone which consist of irregular blocks separated by clefts. The joints within the limestone have been enlarged by chemical weathering to form a pattern of clints (ridges) and grykes (clefts). Limestone pavements are typical of Karst scenery, a type of limestone topography produced by percolating ground waters and underground streams and named after the Karst region of former Yugoslavia. Photographed at The Burren, County Clare, Ireland.
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