Katian
Key events in the Ordovician
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Key events of the Ordovician Period.
ICS approved stages.
Axis scale: millions of years ago.
ICS approved stages.
Axis scale: millions of years ago.
The Katian is the second stage of the Upper Ordovician. It is preceded by the Sandbian and succeeded by the Hirnantian stage. The Katian began 453.0 ± 0.7 million years ago and lasted for about 7.8 million years until the beginning of the Hirnantian 445.2 ± 1.4 million years ago.