MESOZOIC ERA:
TRIASSIC PERIOD
interval of geologic time from about 245 to 208 million years ago. It marks the beginning of the Mesozoic Era of Earth history. It is divided into the Early Triassic Epoch (245 to 240 million years ago), the Middle Triassic Epoch (240 to 230 million years ago), and the Late Triassic Epoch (230 to 208 million years ago). The rocks that originated during the Triassic Period make up the Triassic System. 
JURASSIC PERIOD
interval of geologic time from 208 to 144 million years ago. It is often divided into the Early Jurassic Epoch (208 to 187 million years ago), the Middle Jurassic Epoch (187 to 163 million years ago), and the Late Jurassic Epoch (163 to 144 million years ago). The Jurassic Period is one of the three major divisions of the Mesozoic Era and is preceded by the Triassic Period and followed by the Cretaceous Period. The rocks that originated during this period constitute the Jurassic System. 
CRETACEOUS PERIOD
interval of geologic time from approximately 144 to 66.4 million years ago. It is often divided into the Early Cretaceous Epoch (144 to 97.5 million years ago) and the Late Cretaceous Epoch (97.5 to 66.4 million years ago). As the final period of the Mesozoic Era, the Cretaceous Period follows the Jurassic Period and precedes the Tertiary Period. The Cretaceous spans more than 77 million years, making it the longest period of Phanerozoic time. The rocks that originated during the period make up the Cretaceous System.

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