Drumian

Rarity: Common

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What Wikipedia says

The Drumian is a stage of the Miaolingian Series of the Cambrian. It succeeds the Wuliuan and precedes the Guzhangian. The base is defined as the first appearance of the trilobite Ptychagnostus atavus around 504.5 million years ago.

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

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