A Limestone Pavement with well developed Clints (blocks) and Grykes (gaps). This is Carboniferous age limestone, part of a large area of Karst above Austwick, Yorkshire, UK. Slightly acidic rainfall, erodes and enlarges naturally occurring joints in the limestone leaving a characteristic pavement surface. Pen y ghent, one of the Yorkshire '3 Peaks' is in the background. February 2018.