GEOLOGICA BELGICA (2020) 23/3-4: xxx-xxx The Kasterlee Formation and its relation with the Diest and Mol Formations in the Belgian Campine NOËL VANDENBERGHE1,*, LAURENT WOUTERS2, MARCO SCHILTZ3, KOEN BEERTEN4, ISAAC BERWOUTS5, KOEN VOS5, RIK HOUTHUYS6, JEF DECKERS7, STEPHEN LOUWYE8, PIET LAGA9, JASPER VERHAEGEN10, RIEKO ADRIAENS11, MICHIEL DUSAR9. 1 Dept. Earth and Environmental Sciences, KU Leuven, Belgium;
[email protected]. 2 ONDRAF/NIRAS, Brussels, Belgium;
[email protected]. 3 Samsuffit, Boechout, Belgium;
[email protected]. 4 SCK, Mol, Belgium;
[email protected]. 5 Sibelco, Belgium;
[email protected];
[email protected]. 6 Consultant, Belgium;
[email protected]. 7 VITO, Mol, Belgium;
[email protected]. 8 Geology, UGent, Belgium;
[email protected]. 9 Geological Survey of Belgium, Brussels, Belgium;
[email protected];
[email protected]. 10 VPO, Planning Bureau for the Environment and Spatial Development, Department of Environment, Flemish Government, Koning Albert II-laan 20, 1000 Brussels, Belgium;
[email protected]. 11 Qmineral, Heverlee-Leuven, Belgium;
[email protected]. * corresponding author. ABSTRACT. Stratigraphic analysis of cored and geophysically logged boreholes in the Kasterlee-Geel-Retie-Mol-Dessel area of the Belgian Campine has established the presence of two lithostratigraphic units between the classical Diest and Mol Formations, geometrically related to the type Kasterlee Sand occurring west of the Kasterlee village and the study area. A lower ‘clayey Kasterlee’ unit, equivalent to the lithology occurring at the top of the Beerzel and Heist-op-den-Berg hills, systematically occurs to the east of the Kasterlee village. An overlying unit has a pale colour making it lithostratigraphically comparable to Mol Sand although its fine grain size, traces of glauconite and geometrical position have traditionally led stratigraphers to consider it as a lateral variety of the type Kasterlee Sand; it has been named the ‘lower Mol’ or ‘Kasterlee-sensu-Gulinck’ unit in this study.