[stage] The Aquitanian is, in the ICS` geologic timescale, the oldest age or lowest stage in the Miocene. It spans the time between 23.03 ± 0.05 Ma and 20.43 ± 0.05 Ma (million years ago) and is a dry, cooling period. The Aquitanian succeeds the Chattian (the youngest age of the Oligocene) and precedes the Burdigalian. The Aquitanian age ...
• (a.) Of or pertaining to Aquitania, now called Gascony.
Aq`ui·ta'ni·an adjective Of or pertaining to Aquitania, now called Gascony . 
The lowest stage of the micene23.3 - 21.5 Ma