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Cambrian

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

Cambrian Earliest period of the Palaeozoic era, lasting from c. 590 million to 505 million years ago. Cambrian rocks are the earliest to preserve the hard parts of animals as fossils. They contain a large variety of fossils, including all the animal phyla, with the exception of the vertebrates. The commonest animal forms were trilobites, Brachiopoda, sponges and snails. Plant life consisted mainly of seaweeds.

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