Cambrian a. : Of or pertaining to Cambria or Wales.

Cambrian a. : Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.

Cambrian n. : A native of Cambria or Wales.

Cambrian n. : The Cambrian formation.

Example:
What type of life existed before the Cambrian explosion?

Taxonomy
Cambrian, Cambrian period, subdivisions, Stratigraphy, duration, the Cambrian explosion, organisms, supercontinent, Precambrian-Cambrian boundary, stages, free encyclopedia, sea level, trace fossils, epochs, carbon-13, Oman, preservation, microbial.

Defination from the web:
Cambrian is the first geological period of the Paleozoic era, lasting from 542 ± 0.3 million years ago to 488.3 ± 1.7 million years ago (ICS, ... The Cambrian is unique in its unusually high proportion of lagerstatte. ...