A limestone pavement is a natural karst landform consisting of a flat, incised surface of exposed limestone that resembles an artificial pavement. The term is mainly used in the UK and Ireland, where many of these landforms have developed distinctive surface patterning resembling paving blocks. Similar landforms in other parts of the world are known as alvars.
Formation of a limestone pavementEdit
Conditions for limestone pavements are created when an advancing glacier scrapes away overburden and exposes horizontally bedded limestone, with subsequent glacial retreat leaving behind a flat, bare surface. Limestone is slightly soluble in water and especially in acid rain, so corrosive drainage along joints and cracks in the limestone can produce slabs called clints isolated by deep fissures called grikes or grykes (terms derived from a northern English dialect). If the grykes are fairly straight and the clints are uniform in size, the resemblance to man-made paving stones is striking, but often they are less regular. Limestone pavements that develop beneath a mantle of topsoil usually exhibit more rounded forms.
Limestone pavements can be found in many previously-glaciated limestone environments around the world. Notable examples are found in the Yorkshire Dales and Cumbria in Northern England, such as those above Malham Cove, on the side of Ingleborough, and above Grange-over-Sands. They are also found in the Stora Alvaret in Öland, Sweden; in the Burren, County Clare, Ireland, the Great Northern Peninsula on Newfoundland, and in the Désert de Platé, in the French Alps.
- Alvar – Biological environment based on a limestone plain with thin or no soil and, as a result, sparse grassland vegetation
- Calcareous glade – Calcareous glades occur where bedrock such as limestone occurs near or at the surface, and have very shallow and little soil development.
- Karst – Topography formed from the dissolution of soluble rocks
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