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Cambrian

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Cambrian The first of six periods of the Palaeozoic Era, from about 542–488.3 Ma ago, during which sediments deposited include the first organisms with mineralized skeletons. Common fossils include Brachiopoda, Trilobitomorpha, Ostracoda, and, late in the period, Graptolithina. Trilobites are important in the stratigraphic subdivision of the period.

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