W.J. Kennedy, F. Amédro, F. Robaszynski, & J.W.M. Jagt. (2011). Ammonite faunas from condensed Cenomanian-Turonian sections (‘Tourtias’) in southern Belgium and northern France. Netherlands Journal of Geosciences, 90, 209 - 238. https://doi.org/10.1017/S0016774600001128