At Folkestone, the sequence boundary at the base of Cenomanian 1 is the unconformity between the Gault and the Chalk Group, and the overlying Glauconitic Marl is a condensed transgressive sequence tract (Gale et al., 1996). A maximum flooding surface occurs at the base of the S. schlueteri Subzone, and the top of the sequence is a limestone (= 'M3' of Gale, 1989) with abundant specimens of the ammonite Schloenbachia (Gale et al., 1999).
GALE, A S. 1989. Field meeting at Folkestone Warren, 29th November, 1987. Proceedings of the Geologists' Association, 100, 73-82.
GALE, A S, KENNEDY, W J, BURNETT, J A, CARON, M & KIDD, B E. 1996. The Late Albian to Early Cenomanian succession at Mont Risou near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research, 17, 515-606.
GALE, A S, HANCOCK, J M & KENNEDY, W J. 1999. Biostratigraphical and sequence correlation of the Cenomanian successions in Mangyshlak (W. Kazakhstan) and Crimea (Ukraine) with those in southern England. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, 69, 67-86.