Middle Devonian limestone, mainly massive and micritic but bioclastic in part. Bedding is obscure, the dip is steep to the SE. Cleavage seen in places dips about 20° NW. The limestone has an irregular palaeokarst surface and is penetrated by deep narrow fissures filled with brown Permian sandstone which contains angular limestone fragments in places, some of large size. Pleistocene/Holocene solution fissures in the limestone are associated with coatings of flowstone. Engineering geological applications include the use of rock bolts for the large scale stabilisation of rock faces in association with steel mesh to prevent falls of smaller rock fragments.