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Carnian

Period
The Carnian is the lowermost stage of the Upper Triassic Series. It lasted from 237 to 227 million years ago. The Carnian is preceded by the Ladinian and is followed by the Norian. Wikipedia
Occurred: 237 million years ago - 227 million years ago
Lower boundary definition: FAD of the Ammonite Daxatina canadensis
Lower boundary GSSP: Prati di Stuores, Dolomites, Italy; 46°31′37″N 11°55′49″E / 46.5269°N 11.9303°E
Lower GSSP ratified: 2008
Upper boundary GSSP candidate section(s): Black Bear Ridge, British Columbia, Canada; Pizzo Mondello, Sicily, Italy;