Terreneuvian

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What Wikipedia says

The Terreneuvian or Early Cambrian is the lowermost and oldest series of the Cambrian geological system. Its base is defined by the first appearance datum of the trace fossil Treptichnus pedum around 538.8 million years ago.

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

Image: Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; Kocsis, Ádám T., CC BY 4.0, via Wikimedia Commons.