2,533 pages on this wiki. The Triassic (Alberti, 1834) is a geologic period that extends from about 253 to 195 million years ago (MYA). As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events.s the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events.