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
Early Jurassic
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The Early Jurassic Epoch is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic–Jurassic extinction event, 201.3 Ma, and ends at the start of the Middle Jurassic 174.7 ±0.8 Ma.
Massive cliffs in Zion Canyon consist of Lower Jurassic formations, including (from bottom to top): the Kayenta Formation and the massive Navajo Sandstone
Lias formations at Lyme Regis, UK, known locally as Blue Lias