Rupelian Stage

All those rocks deposited worldwide during the Rupelian Age (36.6 to 30 million years ago). The Rupelian is the earlier of two stages in the Oligocene Series and comprises the Lower Oligocene. It was named for exposures studied along the Rupel, a tributary of the Scheldt River in Belgium. This area formerly served as the type district for the stage. The global stratotype section