Keutgen , N. “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, vol. 97, Nov. 2018, pp. 229-60, doi:10.1017/njg.2018.15.