Stert Brook Exposure is a geological Site of Special Scientific Interest in Potterne parish in Wiltshire, England, notified in 1989. The site covers both banks of an unnamed brook north of Crookwood Farm, about south of Devizes,[1] and provides a section through marine rocks of the late Jurassic age. It has rock-types from both north Wiltshire / Oxfordshire and south Wiltshire.[2]