Boomer, I., Lord, A.R., Page, K.N., Bown, P.R., Lowry, F.M.D. and Riding, J.B. (2009) The biostratigraphy of the upper Pliensbachian-Toarcian (Lower Jurassic) sequence at Ilminster, Somerset. Journal of Micropalaeontology, 28 (1). pp. 67-85. ISSN 0262-821X (Print), 2041-4978 (Online) (doi:https://doi.org/10.1144/jm.28.1.67)