Katian

Rarity: Common

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What Wikipedia says

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 452.8 million years ago and lasted for about 7.6 million years until the beginning of the Hirnantian 445.2 million years ago.

Excerpt from the Wikipedia article “Katian”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fama Clamosa, CC BY-SA 4.0, via Wikimedia Commons.