Investigating Fossils. Wilson J. Wall

whole taxons which were on the planet before vertebrates appeared.

References

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      6 Kragh, H. (2008). From geochemistry to cosmochemistry: the origin of a scientific discipline, 1915–1955. In: Chemical Sciences in the 20th Century: Bridging Boundaries (ed. C. Reinhardt). Wiley.

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      9 Smith, E.F. (2019). Pyritization of soft tissue at the Precambrian‐Cambrian boundary in the southwest USA. The Palaeontological Association Newsletter 102: 65–67.