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The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time approximately 538.8 million years ago in the Cambrian period of the early Paleozoic when a sudden radiation of complex life occurred, and practically all major animal phyla started appearing in the fossil record.
The Cambrian (/ ˈ k æ m b r i. ə n, ˈ k eɪ m-/ KAM-bree-ən, KAYM-; sometimes symbolized Ꞓ) is the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 485.4 Ma.
The Precambrian accounts for 88% of the Earth's geologic time. The Precambrian is an informal unit of geologic time, [3] subdivided into three eons ( Hadean , Archean , Proterozoic ) of the geologic time scale .
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Create account; Log in; Pages for logged out editors learn more. ... Pages in category "Cambrian life" The following 17 pages are in this category, out of 17 total.
The Avalon explosion was a time of early evolution and low diversity in species. There were over 270 species defined, [10] with 50 different morphological characteristics categories, many of which the anatomical structure had to be inferred with fossils and casts. [4] [10] These species were placed into 20 different genera.