Article: Brachiopods and the stratigraphy of the Upper Campanian and Lower Maastrichian Chalk of Norfolk, England
Thirty-four species of brachiopods are described from the Upper Campanian and Lower Maastrichtian Chalk of Norfolk. The Campanian-Maastrichtian boundary sequence in Norfolk is very poorly exposed and is condensed. However, the existence of a highly diverse micromorphic brachiopod fauna allows correlation with more complete and well-exposed sections elsewhere in northwest Europe, especially northwest Germany and Denmark. Most of the brachiopod zones established in continental northwest Europe can be recognized in Norfolk. These are from below: the tenuicostata-longicollis Zone (corresponding to the bulk of the Upper Campanian of Norfolk), the longicollis-jasmundi Zone (uppermost Campanian), the acutirostris-spinosa Zone (basal Maastrichtian), the spinosa-pulchellus Zone (middle part of the Lower Maastrichtian) and the pulchellus-pulchellus Zone (upper Lower Maastrichtian). The stratigraphical scheme of previous workers was essentially based on faunal and subordinate lithological criteria. This is revised within a strictly lithostratigraphical framework to avoid ambiguities. Eight members are recognized comprising, from below: Eaton Chalk, Weybourne Chalk (including Catton Sponge Bed at its top), Beeston Chalk, Paramoudra Chalk, Sidestrand Chalk, Trimingham Sponge Beds, Little Marl Point Chalk, and Beacon Hill Grey Chalk Members.