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The Middle Triassic featured the beginnings of the breakup of Pangaea, and the opening of the Tethys Sea.The ecosystem had recovered from the devastation that was the Great Dying.
The most common vertebrate life on earth were Lystrosaurus, labyrinthodonts, and Euparkeria along with many other creatures that managed to survive the Great Dying.
The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction which is known for having killed off non-avian dinosaurs, as well as other plant and animal species.
The Mesozoic was a time of significant tectonic, climate and evolutionary activity.
It is also known as the "Great Dying" because it is considered the largest mass extinction in the Earth's history.
The upper boundary of the Mesozoic is set at the Cretaceous–Paleogene extinction event (or K–Pg extinction event), which may have been caused by the impactor that created Chicxulub Crater on the Yucatán Peninsula.
Temnospondyls evolved during this time and would be the dominant predator for much of the Triassic.