Small shelly fossils of late Precambrian and early Cambrian age: a review of recent work

@article{Matthews1975SmallSF,
  title={Small shelly fossils of late Precambrian and early Cambrian age: a review of recent work},
  author={S. C. Matthews and Vladimir V. Missarzhevsky},
  journal={Journal of the Geological Society},
  year={1975},
  volume={131},
  pages={289 - 303}
}
Stratigraphic sections in the high Precambrianlow Cambrian of Siberia are described. They have yielded the variety of fossils—archaeocyathids, gastropods, hyolithids, hyolithelminthids, poriferids, tommotiids and others—that characterize the Tommotian, Atdabanian and Lenian Stages. Some shelly fossils are found high in the Precambrian (Yudomian). The Tommotian Stage is regarded here as the lowest Cambrian unit. Trilobites first appear at the base of the Atdabanian Stage. A selection of fossils… 

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