Geets, S., Maréchal, R., Laga, P., 2000. Lithostratigrafie van het Paleogeen (Nl/Fr). Stratigrafische Commissie Tertiair.
Gladenkov, A., 2014. Bipolar distribution of some earliest Oligocene marine diatoms. Nova Hedwigia, Beiheft 143, p. 337–368. 4 fi gures, 2 tables and 3 plates.
Vandenberghe, N. & Louwye, S. (Eds), 2020. The Neogene stratigraphy of northern Belgium. Geologica Belgica.