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The Stokenchurch Gap, also known as the Aston Hill cutting ([1]) ,Chiltern Gap or as its known locally "Chicken shit alley" (Due to Chicken waste being sprayed on the edges to encourage grass to grow) is a steep chalk cutting, constructed through the Chiltern Hills in Buckinghamshire, England during the early 1970s for the M40 motorway. It is 1200 metres long and a maximum of 47 metres deep, and is located approximately eight miles (13 km) from High Wycombe and close to the village of Stokenchurch. The cutting is mainly through the Upper Chalk, with some Middle Chalk seen at its base.