Cambrian

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Related to Cambrian fauna: Cambrian Mountains

Cambrian

of, denoting, or formed in the first 65 million years of the Palaeozoic era, during which marine invertebrates, esp trilobites, flourished

Cambrian

[′kam·brē·ən]
(geology)
The lowest geologic system that contains abundant fossils of animals, and the first (earliest) geologic period of the Paleozoic era from 570 to 500 million years ago.