Tithonian
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In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 149.2 ±0.7 Ma and 145.0 ± 4 Ma. It is preceded by the Kimmeridgian and followed by the Berriasian.
Artistic representation of a brachiosaurid, with the Morokweng impactor in the background, moments before impact
The Jurassic-Cretaceous transition saw the extinction of thalassochelydian turtles, such as Plesiochelys
Some studies have argued that sauropods, like Apatosaurus louisae, were strongly impacted by the Tithonian extinction
Image: Emperor Seamounts
Aalenian
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The Aalenian is a subdivision of the Middle Jurassic Epoch/Series of the geologic timescale that extends from about 174.7 ±0.8 Ma to about 170.9 ±0.8 Ma. It was preceded by the Toarcian and succeeded by the Bajocian.
The Aalenian GSSP in Spain