Stratigraphy
Ypresian
| Belongs to | Eocene |
| Type | chronostratigraphy |
| Rank | Stage |
| Scope | global |
| Status | formal standard |
| Author | André Hubert Dumont |
| Year | 1849 |
| Etymon | Ypres, the French name of the Belgian (Flemish) city of Ieper (Ieper) |
| Age top (Ma) | 47.8 |
| Age base (Ma) | 56 |
| Date changed | 2022-11-04 |
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