Aalenian

From Freepedia

The Aalenian is a subdivision of the Middle Jurassic period of the geologic timescale that extends from about 175.6 Ma to about 171.6 Ma (million years ago). It was preceded by the Toarcian era and succeeded by the Bajocian.

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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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