Stratigraphy
Callovian
| Belongs to | Middle Jurassic |
| Type | chronostratigraphy |
| Rank | Stage |
| Scope | global |
| Status | informal standard |
| Author | d’Orbigny |
| Year | 1842 |
| Etymon | Kellaways, place in Wiltshire, England |
| Age top (Ma) | 161.5 |
| Age base (Ma) | 165.3 |
| Date changed | 2022-11-04 |
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