Ordovician - Wikipedia
The 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, and the second of twelve periods of the Phanerozoic Eon.
Ordovician Period | Major Events, Extinction, & Facts | Britannica
2024年10月31日 · 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 - Natural History Museum
2012年8月10日 · The Ordovician* lasted about 45 million years and saw the transition from very primitive to relatively modern life-forms in the seas. The “Ordovician radiation” which followed the late Cambrian extinctions, lead to a tripling of marine diversity, the greatest increase in the history of life, and giving the highest levels of diversity seen ...
Ordovician Period Information and Facts - National Geographic
During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second...
Ordovician Period—485.4 to 443.8 MYA - U.S. National Park Service
2023年4月28日 · Beginning in the Ordovician Period, a series of plate collisions resulted in Laurentia, Siberia, and Baltica becoming assembled into the continents of Laurussia by the Devonian and Laurasia by the Pennsylvanian (also see Cambrian Period).
The Ordovician Period
The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago.* During this period, the area north of the tropics was almost entirely ocean, and most of the world's land was collected …
Prehistoric Life During the Ordovician Period - ThoughtCo
2019年10月13日 · The Ordovician is the second period of the Paleozoic Era (542-250 million years ago), preceded by the Cambrian and succeeded by the Silurian, Devonian, Carboniferous and Permian periods.
Ordovician Period summary | Britannica
Ordovician Period, Interval of geologic time, 485.4–443.4 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian Period. During the Ordovician, many of the landmasses were aligned in the tropics.
The Ordovician System: Key concepts, events and its distribution …
2023年3月10日 · The Ordovician Period was characterized by extreme biogeographic differentiation amongst its biota; all groups were affected, particularly the benthos and to a lesser degree the nekton and plankton.
Ordovician radiation | Marine Life, Climate Change & Extinction ...
Ordovician radiation, an interval of intense diversification of marine animal life that unfolded over tens of millions of years during the Ordovician Period (485.4 million to 443.4 million years ago) of geologic time.