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Algae, sponge, corals, and crustaceans all had recovered, and the reptiles began to get bigger and bigger.New aquatic reptiles evolved, such as ichthyosaurs and nothosaurs.
The era is subdivided into three major periods: the Triassic, Jurassic, and Cretaceous, which are further subdivided into a number of epochs and stages.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.
The Middle Triassic spans roughly from 247 million to 237 million years ago.
Towards the Late Cretaceous large volcanic eruptions are also believed to have contributed to the Cretaceous–Paleogene extinction event.
Approximately 50% of all genera became extinct, including all of the non-avian dinosaurs.
The recent warming led to a boom of reptilian evolution on land as the first true dinosaurs evolved, as well as pterosaurs.
During the Late Triassic, some advanced cynodonts gave rise to the first Mammaliaformes.
The Triassic ranges roughly from 252 million to 201 million years ago.