Andrew D. Leighton (a), Malcolm B. Hart (a), Christopher W. Smart (a), Matt Hampton (b) & Melanie J. Leng (c)
(a) School of Geography, Earth & Environmental Sciences, Plymouth University, Drake Circus, Plymouth PL4 8AA, UK. E-mail: andrew.leighton@plymouth.ac.uk
(b) Network Stratigraphic Consulting Ltd, Harvest House, Cranborne Road, Potters Bar, Hertfordshire EN6 3JF, UK.
(c) Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK.