1. Age of the Wealden in North-Western Europe;Allen;Geol. Mag.,1955
2. Correlation of NW European Purbeck-Wealden (nonmarine Lower Cretaceous) as seen from the English type-areas;Allen;Cretaceous Res.,1991
3. Palaeobotanical and palynological investigation with notes on the microfauna of some core samples from the Lower Cretaceous in the West Netherlands Basin;Amerom;Mededelingen Rijks geologischen Dienst N.S.,1976
4. J.-M. Baele, Genèses de la silicite et de la microbialite turoniennes de Saint-Denis (bord occidental du bassin de Mons, Belgique), thèse de doctorat non publiée, faculté polytechnique, Mons, Belgique, 2003, 215 p.
5. Palynology of Early Cretaceous soil beds and associated strata;Batten;Palaeontology,1973