R. Saeys, A. Verheyen, and N. Vandenberghe. “A Rapid Clay-Mineral Change in the Earliest Priabonian of the North Sea Basin?”. Netherlands Journal of Geosciences 83 (September 1, 2004): 179 - 185. Accessed March 27, 2026. https://njgjournal.nl/index.php/njg/article/view/11560.