Limestone Pavement is a rare, natural feature which makes a significant contribution to the landscape and provides an important habitat for a wide range of flora.  It is characterised by its pattern of clints (blocks) and grykes (fissures), formed by the action of glaciation and water.  It is an irreplaceable resource that is threatened by a growing domestic demand for decorative and rockery stone.Whilst it is largely protected in England by law, it may be sourced from existing planning permissions, Ireland, the High Alps and the former Yugoslavia.The Landscape Institute is concerned at this threat to the natural landscape and fully supports the aims of The National Limestone Pavement Campaign.  It therefore recommends that Institute Members should avoid specifying the use of water-worn limestone.(based on Landscape Institute Position statement August 1996)