Series 2
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| Cambrian period 542-488 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Terreneuvian 542-521 | Series 2 521-510 | Series 3 510-499 | Furongian 499-488 | ||||||
| Fortunian 542-528 | Stage 2 528-521 | Stage 3 521-515 | Stage 4 515-510 | Stage 5 510-506 | Drumian 506-503 | Guzhangian 503-499 | Paibian 499-496 | Stage 9 496-492 | Stage 10 492-488 |
521 to 510 million years ago
Preliminary note on nomenclature: an epoch is a slice of time, a series a sequence of rock. The Cambrian Epoch 2 is thus the time when the Cambrian Series 2 was laid down. If and when the ICS gets around to formally naming this epoch and series we'll use that name whenever the reference is clear; until then we're stuck variously speaking of Epoch or Series 2.
Introduction
This epoch stretches from the first appearance of the trilobites to the end of the great archaeocyath reefs. It sees a great diversification of many kinds of metazoans - it's the chief segment of the "Cambrian explosion" - and ended with a profound faunal turnover, arguably a mass extinction. The Chengjiang and Sirius Passet lagerstätten date from this epoch.
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| Up: Cambrian Period |
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