1. The Nature of the Stratigraphical Record;Ager,1973
2. The Pliocene–Pleistocene boundary;Aguirre;Episodes,1985
3. Chronostratigraphic framework for the Thanetian and lower Ypresian deposits of southern England;Ali,1996
4. The Downtonian and Dittonian facies of the Welsh Borderland;Allen;Geological Magazine,1963
5. The Jurassic System in Great Britain;Arkell,1933