TriassicMesozoic

Triassic Mesozoic is a term that sometimes appears in discussions about prehistoric life, though it is not a standard geological or paleontological classification. It seems to be a conflation of the Triassic Period and the Mesozoic Era. The Mesozoic Era, often called the "Age of Reptiles," spanned from approximately 252 to 66 million years ago. It is divided into three periods: the Triassic, the Jurassic, and the Cretaceous. The Triassic Period, the first of these, lasted from about 252 to 201 million years ago. This period marked the recovery of life after the Permian-Triassic extinction event, the most severe extinction in Earth's history. During the Triassic, early dinosaurs began to evolve, as did the first mammals and pterosaurs. Large reptiles like crurotarsans also dominated. The end of the Triassic was marked by another significant extinction event, which paved the way for the diversification of dinosaurs in the subsequent Jurassic Period. Therefore, when "Triassic Mesozoic" is mentioned, it likely refers to the early part of the Mesozoic Era, specifically the Triassic Period and its associated life forms and geological events.