Ronan, J. & Duffin, C.J. & Hildebrandt, C. & Parker, A. & Hutchinson, D. & Copp, C. & Benton, M.J. (2020)
Beginning of Mesozoic marine overstep of the Mendips: The Rhaetian and its fauna at Hapsford Bridge, Vallis Vale, Somerset, UK.
Proceedings of the Geologists' Association, 131(5), 578–594