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).'
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/g-Li6HGDXfji0FWHT7uuxw== | 5.88129e-14 |
| dbr:Bartonian | 5.88129e-14 |