Dinopedia
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System (period) Series (epoch) Stage (age) Lower boundary, Ma
Jurassic Lower Hettangian 201.4±0.2
Triassic Upper (Late) Rhaetian ~208.5
Norian ~227
Carnian Golden spike~237
Middle Ladinian Golden spike~242
Anisian 247.2
Lower (Early) Olenekian 251.2
Induan Golden spike251.902±0.024
Permian Lopingian Changhsingian older
Subdivisions and "golden spikes" according to IUGS as of September 2023[1]

In the geologic timescale, the Anisian is the lower stage or earliest age of the Middle Triassic series or epoch and lasted from 247.2 million years ago until 242 million years ago. The Anisian age succeeds the Olenekian age (part of the Early Triassic epoch) and precedes the Ladinian age.

References[]

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