Middle Triassic
Period
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In the geologic timescale, the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided in chronostratigraphy. The Middle Triassic spans the time between 247.2 Ma... Wikipedia
Period: Triassic
Occurred: 247.2 million years ago - 237 million years ago
Upper boundary definition: FAD of the Ammonite Daxatina canadensis
Upper GSSP ratified: 2008