The Triassic, Jurassic, and Cretaceous together are called the Mesozoic Era.
Tips
memory
三 (sān) = three, 叠 (dié) = layered/stacked: the period was named in the 1830s after a distinctive three-layered rock sequence in Germany. The Mesozoic trio in Chinese: 三叠纪 → 侏罗纪 (Jurassic) → 白垩纪 (Cretaceous).
