Sequence biostratigraphy of European chalks

Stratigraphic studies of Late Cretaceous sequences in northwest Europe frequently fail to<br>identify subtIe changes in both lithofacies and biofacies due to the apparent monotonous nature<br>of chalk sediments. This results in the non-recognition of many major factors affecting the<br>stratigraphic succession, well geohistories and the mis-interpretation of regional sequentiaI<br>history.