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Jul 2, 2024 · The Cambrian explosion, a rapid burst of evolution 540 million years ago, may have been triggered by only a small increase in oxygen levels in Earth’s atmosphere and shallow ocean waters, according to a July 2 study in Nature Geoscience from an international consortium of scientists from more than 50 institutions.
- Cambrian Conundrum
- Oxygen on The Rise
- Habitat Helpers
- Cascade of Events
An amazing glimpse into the Cambrian Explosion comes from a rock formation found in the Canadian Rockies of British Columbia. This Burgess Shale preserves countless fossils of Cambrian creatures. The organisms became fossilized after they were trapped in muddy marine sediments that later turned to stone. The fossils record fine details of these cre...
Earlier, during a very long stretch of time known as the Precambrian, life was simple. Bacteria dominated, quietly clumping into slimy mats. Then, starting around 3.5 billion years ago, some of those bacteria began producing oxygen as a byproduct of photosynthesis. Until then, there had been little or no oxygen, which complex animals need. Around 2...
The steady increase in oxygen levels over hundreds of millions of years certainly could have set the stage for the upcoming explosion in animal life. The simpler life forms that had emerged before the Cambrian Explosion helped set the stage too, says Don Canfield. He’s a geologist at the University of Southern Denmark, in Odense. There, Canfield st...
Harper, the Durham University paleontologist, has considered all of the factors that may have contributed to the Cambrian Explosion. He’s read about what others have found — Precambrian fossils, new estimates of ancient oxygen levels, shifting continents and evolving climates. He’s also probed rocks and fossils for clues. Last year, working with M....
Feb 16, 2016 · The Cambrian explosion, as it is called, produced arthropods with legs and compound eyes, worms with feathery gills and swift predators that could crush prey in tooth-rimmed jaws. Biologists have...
- Douglas Fox
Feb 19, 2019 · The Cambrian explosion is one of the most important intervals in the history of life. Now, new research published in the Proceedings of the National Academy of Sciences (USA) is revealing that this explosion was far shorter than many experts had thought.
Oct 1, 2024 · 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. Many other.
The Cambrian explosion (also known as Cambrian radiation [1] or Cambrian diversification) is an interval of time 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.
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Nov 9, 2018 · Stem lophoporates, brachiopods and molluscs (halkieriids, chancelloriids and orthothecimorph hyoliths) appeared in the terminal Ediacaran (~542.5 Ma) and show two phases of diversification: the ...
