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The Cambrian (/ ˈ k æ m b r i. ə n, ˈ k eɪ m-/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. [5] The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma.
This timeline of Cambrian research is a chronological listing of events in the history of geology and paleontology focused on the study of Earth during the span of time lasting from 538.8 to 485.4 million years ago (dates as per 2022 revision) [1] and the legacies of this period in the rock and fossil records.
c. 538.8 ± 0.2 Ma – beginning of the Cambrian Period, the Paleozoic Era and the current Phanerozoic Eon. End of the Ediacaran Period, the Proterozoic Eon and the Precambrian Supereon. The Ediacaran fauna disappears, while the Cambrian explosion initiates the emergence of most forms of complex life, including vertebrates ( fish ), arthropods ...
The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time beginning approximately 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.
Cambrian graphical timeline −540 — ... Subdivision of the Cambrian according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago. References
Some of these Cambrian groups appear complex but are seemingly quite different from modern life; examples are Anomalocaris and Haikouichthys. More recently, however, these seem to have found a place in modern classification. [157] During the Cambrian, the first vertebrate animals, among them the first fishes, had appeared.
The Cambrian is a major division of the geologic timescale that begins about 538.8 ± 0.2 Ma. [40] Cambrian continents are thought to have resulted from the breakup of a Neoproterozoic supercontinent called Pannotia. The waters of the Cambrian period appear to have been widespread and shallow. Continental drift rates may have been anomalously high.
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, ... Cambrian explosion.