The Bartonian (also known as the Auversian) is a stage of the middle Eocene Epoch. It spans the time between 40.4 ± 0.2 Ma and 37.2 ± 0.2 Ma (million years ago).'
References[]
| Paleocene epoch | Oligocene epoch | |
|---|---|---|
| Danian | Selandian Thanetian |
Ypresian | Lutetian Bartonian | Priabonian |
Rupelian | Chattian |