Abstract
In SE England the junction between the Gault Clay Formation and the Lower Chalk Formation is taken as the Albian/Cenomanian boundary. Off-shore a small cycle of sedimentation intervenes between these two formations and, by the rules of stratigraphic nomenclature, must be of latest Albian age. Foraminifera are exceptionally abundant throughout this interval and many agglutinated taxa are used in biozonation. The glauconite-rich basal bed of the chalk succession, of earliest Cenomanian age, contains an abundant, diverse, assemblage of agglutinated taxa, many of which grow to exceptional size. This assemblage is seen nowhere else in the UK succession and its occurrence at this level is taken as indicative of a sudden environmental change.
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