The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 161.5 million years ago. Fossils of land-dwelling animals
the beginning of the Cretaceous Period, 143.1 Ma. The Jurassic constitutes the second and middle period of the Mesozoic Era as well as the eighth period
during the Jurassic, around 163 million years ago, with the modern families likely splitting from each other sometime between the Middle Jurassic and the
Wang P, Yi J, Wei G, You H, Ren X (2022). "New macronarian from the Middle Jurassic of Chongqing, China: phylogenetic and biogeographic implications for
Jurassic starts immediately after the Triassic–Jurassic extinction event, 201.3 Ma (million years ago), and ends at the start of the Middle Jurassic 174
Euskelosaurus, Heterodontosaurus, Abrictosaurus, and Lesothosaurus. In the Middle Jurassic, the sauropods Atlasaurus, Chebsaurus, Jobaria, and Spinophorosaurus
landmass, called Pangaea, of which Europe was a part. By the start of the Jurassic period, some 30 million years later, the supercontinent began to split
the Triassic and Early Jurassic falling within the bird-dominated region of morphospace, and evidence of some Middle Jurassic tridactyl tracks from the
Ooimmuration: Enhanced fossil preservation by ooids, with examples from the Middle Jurassic of southwestern Utah, USA. Palaios 36: 326-329. https://doi.org/10
Allington-Jones, Lu; Barrett, Paul M. (2024-02-05). "A new pterosaur from the Middle Jurassic of Skye, Scotland and the early diversification of flying reptiles"