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 ...
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.
Prehistoric Life During the Ordovician Period - ThoughtCo
WEBOct 13, 2019 · Plant Life. As with the preceding Cambrian, evidence for terrestrial plant life during the Ordovician period is maddeningly elusive. If land plants did exist, they consisted of microscopic green algae floating on or just underneath the surface of ponds and streams, along with equally microscopic early fungi.
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 - Natural History Museum
WEBAug 10, 2012 · Starfish, brittle stars, crinoids, and echinoids, all of which have living representatives, first appeared in the Ordovician. In the evolutionary history of animal life this radiation was second only to the “Cambrian explosion” in importance.
Ordovician Period—485.4 to 443.8 MYA - U.S. National Park Service
WEBApr 28, 2023 · The sea teemed with life different from its Cambrian predecessors such as bivalves, gastropods (snails), bryozoans (moss animals), and crinoids (sea lilies). Bryozoans first appeared in the Ordovician and comprise an important group of colonial, marine organisms that still exist today.
The Ordovician System: Key concepts, events and its distribution …
WEBMar 10, 2023 · The colonizations of land by plants together with invertebrate and vertebrate animals are key events in the history of life. The Ordovician radiation, now generally called Great Ordovician Biodiversity Event (GOBE), was first recognized in the 1970s, mostly based on recognition of a rapid diversification of the marine shelly fauna.
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 the …
Ordovician Life on Land and Early Paleozoic Global Change
WEBThis spore, trace fossil and paleosol evidence for life on land in the Ordovician has remained controversial (Buatois et al., 1998; Shear, 1998), but evidence for Ordovician life on land has continued to accumulate.