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 - Natural History Museum
WEBAug 10, 2012 · 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 - Wikipedia
WEBThe Ordovician (/ ɔːr d ə ˈ v ɪ ʃ i. ə n,-d oʊ-,-ˈ v ɪ ʃ ən / 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 ...
Prehistoric Life During the Ordovician Period - ThoughtCo
WEBOct 13, 2019 · 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 Information and Facts - National Geographic
WEBDuring 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 - Marine Life, Trilobites, Brachiopods
WEBAug 9, 2024 · During the Ordovician Period, life diversified to an unprecedented degree, undergoing a fourfold increase in the number of genera. This unique period, known as the Ordovician radiation, unfolded over tens of millions of years and produced organisms that would dominate marine ecosystems for the remainder of the Paleozoic Era .
Ordovician Period
WEBAs mentioned in the Cambrian Period, for most of Earth's history the dominant life form on Earth was single-celled anearobic bacteria. Over time, cyanobacteria (formerly known as blue-green algae) and ocean living plants developed .
Evolution: Change: Deep Time - PBS
WEBOrdovician Period (490-443 mya) Life responds quickly following the Cambrian extinction. In fact, species exhibit far greater diversity in the Ordovician than in the "explosive" preceding...
The Ordovician Period - Paleontology World
WEBLife. Ordovician strata are characterized by numerous and diverse trilobites and conodonts (phosphatic fossils with a tooth-like appearance) found in sequences of shale, limestone, dolostone, and sandstone.
The Ordovician - University of California Museum of Paleontology
WEBThroughout the Ordovician, Gondwana shifted towards the South Pole and much of it was submerged underwater. The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites , trilobites , brachiopods , and …