Proper noun
Carnian
(geology) The lowermost stage of the Upper Triassic series (or earliest age of the Late Triassic epoch), which lasted from 237 to 227 million years ago and was preceded by the Ladinian and followed by the Norian.
The Lepidosauromorpha —specifically the Sphenodontia —are first known in the fossil record a little earlier (during the Carnian). Source: Internet