Cambrian Stage 3
Unnamed third stage of the Cambrian
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Through Chordate
The lack of name does not indicate a lack of importance; for example, this stage contains both the Chengjiang biota and the Sirius Passet biota.
Naming
The International Commission on Stratigraphy has not officially named the 3rd stage of the Cambrian. The stage approximately corresponds to the "Atdabanian", which is used by geologists working in Siberia.
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Biostratigraphy
The oldest trilobite known is Lemdadella which appears at the beginning of the Fallotaspis zone. The Cambrian radiation of animal phyla ends here, after the diversification and origination of arthropods, molluscs, lophophorates, chordates (including vertebrates) among others.

