The footpath north of Clawthorpe enters an area of limestone pavement which includes some remarkably large and smooth slabs - almost like poured concrete. There are examples of shallow runnels such as the one shown here, formed by a combination of chemical solution of the limestone and erosion.
Uploaded to Geograph by Karl and Ali on 6 April 2014
Photo © Karl and Ali, 6 April 2014. Licensed for reuse under this Creative Commons licence