Triassic-Jurassic boundary

The Triassic-Jurassic boundary marks a major event about 201 million years ago when Earth’s environment and life dramatically changed. It signaled the end of the Triassic period and the start of the Jurassic period. This boundary likely resulted from massive volcanic eruptions and climate shifts, which caused widespread extinction, wiping out many species including large reptiles and early dinosaurs. This transition allowed new types of dinosaurs and other animals to thrive, shaping the course of life on Earth. The boundary is identified in the geological record by distinct changes in rock and fossil evidence.