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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. 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.
Jul 4, 2024 · Cambrian Period, earliest time division of the Paleozoic Era and Phanerozoic Eon, lasting from 538.8 million to 485.4 million years ago. The Cambrian System, named by English geologist Adam Sedgwick for slaty rocks in southern Wales and southwestern England, contains the earliest record of abundant and varied life-forms.
May 27, 2016 · The end of the Cambrian Period is marked by evidence in the fossil record of a mass extinction event about 485.4 million years ago. The Cambrian Period was followed by the Ordovician...
- Mary Bagley
The end of the Cambrian saw a series of mass extinctions during which many shell-dwelling brachiopods and other animals went extinct. The trilobites also suffered heavy losses.
Nov 19, 2022 · The Cambrian Period likely ended with a sudden mass extinction event that led to the disappearance of many species of trilobites. Researchers believe that the reason for the sudden extinction was a decline in oxygen and the formation of toxic sulfur containing compounds (sulfides).
Although there was plentiful atmospheric oxygen by the beginning of the period, it wasn't until the Cambrian that there was a sufficient reduction in the number of oxygen-depleting bacteria to permit higher oxygen levels in the waters.
Cambrian Period, Oldest time division of the Paleozoic Era. During the Cambrian, 541–485.4 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with less variation between regions.
