Cambrian Stage 4

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What Wikipedia says

Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commission on Stratigraphy.

Excerpt from the Wikipedia article “Cambrian Stage 4”, under the CC BY-SA 4.0 license. Read the article on Wikipedia