One of the mysteries of the English language finally explained.
Designating the lower (older) stage of the Oligocene series, exemplified by certain clays and shales in Belgium and Germany; of or relating to this stage.
The Rupelian stage; the strata collectively dating from this time.
Mid 19th century. From French Rupelien from Rupel, the name of a small tributary of the river Scheldt in Belgium + -ien.
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