Rupelian

First Age of the Oligocene Epoch

The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/Series. It spans the time between 33.9 and 27.82 Ma. It is preceded by the Priabonian Stage and is followed by the Chattian Stage.

This keyword could refer to multiple things. Here are some suggestions: