(geology) Of a geologic period within the Paleozoic era; comprises lower, middle and Furongian epochs from about 542 to 490 million years ago. / Of or relating to Wales.

Synonym of Walian: a Welsh person, a Welshman or Welshwoman.

(geology) The Cambrian period.

plural of Cambrian

(evolutionary biology) The relatively rapid appearance, during the Cambrian Period around 541 million years ago, of most major animal phyla, as demonstrated in the fossil record.

(by extension) The rapid appearance of anything.

(literary) The leek as an emblem of Wales. / (geology) A specific symbol printed on geologic maps, Ꞓ, which denotes any Cambrian-age formation.

(geology, dated) An epoch from 513 to 501 million years ago, ending with the first occurrences of Glyptagnostus reticulatus in the fossil record.

Alternative spelling of Precambrian

Alternative spelling of Precambrian