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 - 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 ...
Late Ordovician mass extinction - Wikipedia
WEBThe Late Ordovician mass extinction (LOME), sometimes known as the end-Ordovician mass extinction or the Ordovician-Silurian extinction, is the first of the "big five" major mass extinction events in Earth's history, occurring roughly 445 million years ago (Ma). [1]
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.
Aegirocassis - Wikipedia
WEBAegirocassis is an extinct genus of giant radiodont arthropod belonging to the family Hurdiidae that lived 480 million years ago during the early Ordovician in the Fezouata Formation of Morocco. It is known by a single species, Aegirocassis benmoulai.
Ordovician Period - Natural History Museum
WEBAug 10, 2012 · Animals include, from left: Cystoids, jawless fish (Sacabambaspis) captured by a large cephalopod (Endoceras), Rugose corals, brachiopods, trilobite, gastropod (Cyclonema), a sea star and coiled cephalopod. Jellies, small nautiloids & graptolites (Orthograptus) are seen to the left.
Discover 5 Incredible Ordovician Period Animals: Facts, …
WEBOct 5, 2022 · Let’s dive deeper and discover 5 incredible Ordovician Period Animals in this article! 1. Graptolites. Due to their abundance, planktonic lifestyle, and well-traced evolutionary tendencies, graptolites are excellent Ordovician and Silurian indicator fossils. ©Aunt Spray/Shutterstock.com
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...
A giant Ordovician anomalocaridid - Nature
WEBMay 25, 2011 · Anomalocaridids, giant lightly sclerotized invertebrate predators, occur in a number of exceptionally preserved early and middle Cambrian (542–501 million years ago) biotas and have come to...
The Ordovician Period - Paleontology World
WEBThe Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). A typical marine community consisted of these animals, plus red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods.