Ordovician - Wikipedia
WEBThe Ordovician (/ ɔːrdəˈvɪʃi.ən, - doʊ -, - ˈvɪʃən / or-də-VISH-ee-ən, -doh-, -VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 Ma (million years ago) to the start of the Silurian Period 443.8 Ma. [10]
Timeline of the evolutionary history of life - Wikipedia
WEBEnd Cretaceous: 66 million years ago, 76% of species lost, including all ammonites, mosasaurs, plesiosaurs, pterosaurs, and nonavian dinosaurs. Smaller extinction events have occurred in the periods between, with some dividing geologic time periods and epochs. The Holocene extinction event is currently under way.
Ordovician Period | Major Events, Extinction, & Facts
WEBAug 9, 2024 · Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago and ended 443.8 million years ago. The interval was a time of intense diversification (an increase in the number of species) of marine animal life in what became known as the Ordovician radiation.
Ordovician Period Information and Facts - National Geographic
WEBLearn more about the time period that took place 488 to 443 million years ago. During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast...
This 480 million-year-old creature is the ancestor of all starfish
WEBJan 21, 2021 · The 480 million-year-old fossil was unearthed in the Moroccan desert more than 17 years ago, but its identity and evolutionary history remained mysteries until now. Scientists have now...
Ordovician Period—485.4 to 443.8 MYA - U.S. National Park Service
WEBApr 28, 2023 · Date range: 485.4 million years ago to 443.8 million years ago; Length: 41.6 million years (0.92% of geologic time) Geologic calendar: November 23 (Noon)–November 26 (7 PM) (3 days, 7 hours)
Ordovician - New World Encyclopedia
WEBPg. N. Earth's land and sea distribution in the Middle Ordovician epoch about 466 million years ago. During the Ordovician's 45 million years, sea level ranged from 180 to 220 to 140 meters (590 to 722 to 459 feet) above the current level. …
An unlikely hero in evolution | Hub - The Hub
WEBThe digging and burrowing of prehistoric worms and other invertebrates along ocean bottoms sparked a chain of events that released oxygen into the ocean and atmosphere and helped kick-start what is known as the Great Ordovician Biodiversification Event roughly 480 million years ago, according to new …
Think Man-Sized Swimming Centipede — And Be Glad It's A …
WEBMar 11, 2015 · This sea monster swam Earth's seas about 480 million years ago and was the biggest creature of its day, scientists say.
Ordovician Period - peripatus.gen.nz
WEBAbout 480 million years ago, in the Ordovician period, life forms diversified dramatically and gave rise to many of the marine forms familiar today. The fossil record of this period is amazingly intact in the Great Basin of California, Utah and Nevada and affords an almost unprecedented opportunity to learn about the conditions that favor ...
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