Cambrian–Ordovician extinction event - Wikipedia
The Cambrian–Ordovician extinction event ended the Cambrian period, and led into the subsequent Ordovician period. It eliminated many brachiopods and conodonts , and severely reduced the number of trilobite species.
List of extinction events - Wikipedia
It does not represent all marine species, just those that are readily fossilized. The labels of the traditional "Big Five" extinction events and the more recently recognised Capitanian mass extinction event are clickable links; see Extinction event for more details. (source and image info)
Cambrian Period: Facts & Information - Live Science
2016年5月27日 · 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...
The Cambrian Mass Extinction
At least four major extinctions occurred during the Cambrian. The first extinction occurred at the Early Cambrian epoch boundary. During this event, the oldest group of trilobites, the olnellids, perished as well as the primary reef-building organisms, the archaeocyathids.
Cambrian explosion - Wikipedia
The Cambrian explosion (also known as Cambrian radiation[1] or Cambrian diversification) is an interval of time beginning 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. [2][3][4] It...
Cambrian Period | National Geographic
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.
Cambrian explosion | Evolution, Paleontology & Geology ...
2024年11月6日 · Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period. The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life.
Oxygen crash led to Cambrian mass extinction - New Scientist
2011年1月5日 · The team conclude that lack of oxygen combined with poisonous hydrogen sulphide killed off many Cambrian animals. Similar events are thought to have caused the massive Permian extinction 251 ...
No (Cambrian) explosion and no (Ordovician) event: A single ...
2023年8月1日 · The Cambrian ‘Explosion’, located by many authors between 540 and 520 million years ago (Ma), is considered to be an abrupt appearance in the fossil record of most animal phyla, with a sudden increase of complex morphologies across metazoan groups.
Tectonic shifts caused mass extinction after “Cambrian ...
2024年6月4日 · Half a billion years ago, life on Earth rapidly expanded in a period known as the “Cambrian explosion.” The fossil record from the Cambrian period (539–485 million years ago) shows...
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