Аннотация:Data are presented about the distribution of planktonic and benthonic foraminifera, ostracods and nannofossils in uninterrupted sections of the Maastrichtain and Danian in Mangyshlak. The Mangyshlak sections are compared with other sections from Denmark, Spain, Tunisia, North America and some oceanic drill holes. An analysis of changes in the organic world on the Maastrichtian-Danian boundary confirmed a connection between these changes and a global reorganisation of ecological conditions. -P.Cooke