De basis van het Mioceen in de groeve Swenden-Wienerberger, Rumst (België)

In the Swenden-Wienerberger quarry of Rumst (Belgium), scattered gravel and reworked fossils are found at the level of contact between the Rupelian Boom Clay Formation and the Burdigalian Berchem Formation. These are traces of the Savian Unconformity and mark an extensive hiatus that includes the entire Chattian (Late Oligocene) and Aquitanian (Earliest Miocene). A mixture of reworked Oligocene and Miocene fossils (including shark teeth, crabs and bones of marine mammals) is found and briefly discussed. The Rumst outcrop is unique, as it is the only outcrop in Belgium where this geological unconformity is permanently exposed.