Stratigraphy
Aalenian
| Belongs to | Middle Jurassic |
| Type | chronostratigraphy |
| Rank | Stage |
| Scope | global |
| Status | formal standard |
| Author | Karl Mayer-Eymar |
| Year | 1864 |
| Etymon | Aalen, vicinity at the northeastern margin of the Swabian Alb |
| Age top (Ma) | 170.9 |
| Age base (Ma) | 174.7 |
| Age reference | Hesselbo et al., 2020 |
| Date changed | 2022-11-04 |
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