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Global distribution of the earliest shelly metazoans

Published online by Cambridge University Press:  01 May 2009

Jiang Zhiwen
Jiang Zhiwen
Affiliation:
Institute of Geological Sciences of Yunnan Province, Kunming, People's Republic of China
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Abstract

The appearance of the first abundant skeletal organisms in the earliest Cambrian was a quantum leap in the evolutionary history of life. It provided the foundations of the animal kingdom from Cambrian times onwards. This paper demonstrates that this evolutionary process resulted from a combination of environmental and biological factors. The author maintains that the appearance of the oldest shelly fossils is a reasonable criterion for defining the Precambrian–Cambrian boundary. This arises not only from the viewpoint of taking the Cambrian Period as the first period in the Palaeozoic Era, but is also a logical extension of regarding the history of life as being divisible into a series of developmental stages.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 3 , May 1984 , pp. 185 - 188
Copyright
Copyright © Cambridge University Press 1984

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