Lower Cambrian vertebrates from south China

@article{Shu1999LowerCV,
  title={Lower Cambrian vertebrates from south China},
  author={D. Shu and Hl Luo and S. Morris and X-L. Zhang and S-X. Hu and L. Chen and J. Han and M. Zhu and Y. Li and L-Z. Chen},
  journal={Nature},
  year={1999},
  volume={402},
  pages={42-46}
}
The first fossil chordates are found in deposits from the Cambrian period (545–490 million years ago), but their earliest record is exceptionally sporadic and is often controversial. Accordingly, it has been difficult to construct a coherent phylogenetic synthesis for the basal chordates. Until now, the available soft-bodied remains have consisted almost entirely of cephalochordate-like animals from Burgess Shale-type faunas. Definite examples of agnathan fish do not occur until the Lower… Expand
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