Search results
Results From The WOW.Com Content Network
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.
The Cambrian explosion was a period of rapid multicellular growth. Most animal life during the Cambrian was aquatic. Trilobites were once assumed to be the dominant life form at that time, [58] but this has proven to be incorrect. Arthropods were by far the most dominant animals in the ocean, but trilobites were only a minor part of the total ...
Volcanic activity, particularly that of large igneous provinces, has been speculated to have been the cause of the environmental crisis. [3] The emplacement of the Namaqualand–Garies dykes in South Africa has been dated to 485 mya, the time at which the Cambrian–Ordovician extinction event occurred, although there remains no unambiguous evidence of a causal relationship between this ...
Cambrian explosion, the large bio-diversification event that occurred during the Cambrian. Opabinia, a genus of bizarre stem-group arthropod distantly related to the radiodonts. Wiwaxia, a genus of possible mollusk that had copious numbers of carbonaceous scales, and lived alongside Anomalocaris. Paleobiota of the Burgess Shale
Molecular clocks detect the radiation of three major clades of bilaterians – lophotrochozoans, deuterostomes, and ecdysozoans – during the early Cambrian. The same study also found that Hox genes diversified before these groups did – meaning that they could not have been the innovation that caused the explosion. [3]
This article originally appeared on USA TODAY: Why did California's Hughes Fire explode in size so fast? Show comments. Advertisement. Advertisement. In Other News. Entertainment. Entertainment.
An image of a damaged pager circulating on social media. CNN could not geolocate the image, but has verified it was published Tuesday, the same day as the explosions.
The Great Ordovician Biodiversification Event (GOBE) was an evolutionary radiation of animal life throughout [1] the Ordovician period, 40 million years after the Cambrian explosion, [2] whereby the distinctive Cambrian fauna fizzled out to be replaced with a Paleozoic fauna rich in suspension feeder and pelagic animals.