Callovian
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The Callovian is a stage on the geologic time scale occurring from 164.7 +/- 4 to 161.2 +/- 4 million years ago.
It is the last stage of the Middle Jurassic.
The stage takes its name from an old spelling of Kellaways Bridge, 3 km north-east of Chippenham in Wiltshire in England.
Fauna
| Jurassic period | |||||
|---|---|---|---|---|---|
| Lower/Early Jurassic | Middle Jurassic | Upper/Late Jurassic | |||
| Hettangian | Sinemurian | Aalenian | Bajocian | Oxfordian | Kimmeridgian |
| Pliensbachian | Toarcian | Bathonian | Callovian | Tithonian | |
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