Cambrian Series 3
(重定向自Middle Cambrian)
Key events in the Cambrian
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-550 —
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-540 —
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-530 —
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-520 —
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-510 —
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-500 —
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-490 —
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Archaeocyatha extinction
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SSF diversification, first brachiopods & archaeocyatha
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First halkieriids, mollusсs, hyoliths SSF
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Treptichnus pedum trace
Large negative peak δ 13Ccarb excursion
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First Cloudina & Namacalathus mineral tubular fossils
Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary.
Cambrian Series 3 is the still unnamed 3rd Series of the Cambrian. It lasted from about ~509 to ~497 million years ago and is divided into 3 stages: the unnamed Stage 5, the Drumian, and the Guzhangian. Cambrian Series 3 is preceded by also unnamed Cambrian Series 2 and succeeded by the Furongian series.