Keutgen , N. 2018. A bioclast-based astronomical timescale for the Maastrichtian in the type area (southeast Netherlands, northeast Belgium) and stratigraphic implications: the legacy of P.J. Felder. Netherlands Journal of Geosciences. 97, (Nov. 2018), 229-260. DOI:https://doi.org/10.1017/njg.2018.15.