Francis Robaszynski, Walter Kegel Christensen. The upper Campanian-Lower Maastrichtian chalks of the Mons basin, Belgium: a preliminary study of belemnites and foraminifera in the Harmignies and Ciply areas. njg [Internet]. 1989Jan.1 [cited 2026Apr.2];:391-408. Available from: https://njgjournal.nl/index.php/njg/article/view/12920