2.5. Kasterlee Formation - Kl

Authors: De Meuter & Laga (1976), after Dumont (1882); age corrected by J. Verhaegen & S. Louwye (26/09/2019)

Description: grey fine micaceous sand, without fossils, slightly glauconiferous, with lenses of micaceous clay; at the base micaceous fine sand, often very glauconitic, burrowed and mottled; at some places, a basal gravel of flints and rare silicified fossils; often hardly distinguishable from the underlying Diest Formation; the upper limit is also hardly distinguishable from the Mol Formation.

Stratotype: outcrops on the hills on the right bank of the Kleine Nete valley.

Area: southern part of the Antwerp Campine and the Limburg Campine; gradual transition to the Kattendijk Formation to the north.

Thickness: up to 15 m in the subsurface of the type locality. Possibly up to 40 m in the northeast of the Antwerp province.

Age: latest Tortonian to Messinian.

Remarks: the formation is also discussed by Halet (1935a).