Ordovician - Wikipedia
WEBPaleogeographic map of the Earth in the middle Ordovician, 470 million years ago. During the Ordovician, the southern continents were assembled into Gondwana, which reached from north of the equator to the South Pole. The Panthalassic Ocean, centered in the northern hemisphere, covered over half the globe. [18]
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, following the Cambrian Period , and ended 443.8 million years ago, when the Silurian Period began.
Ordovician Period - Natural History Museum
WEBAug 10, 2012 · These maps of major tectonic elements (plates, oceans, ridges, subduction zones, mountain belts) are used with permission from Dr. Ron Blakey at Northern Arizona University. The positions of mid-ocean ridges before 200 Ma are speculative.
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—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 age fossil brachiopods, Mississippi National River and Recreation Area, Minnesota. NPS image.
Ordovician Period summary | Britannica
WEBOrdovician 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 …
WEBMar 10, 2023 · 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.
The Ordovician Period
WEBThe Ordovician is a period of geological time, approximately 485 to 444 million years ago. Preceded by the Cambrian and followed by the Silurian, it belongs to the Paleozoic Era. The Ordovician was characterised by widespread epicontinental seas, rapid increase in biodiversity and the Hirnantian mass extinction.
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 - Encyclopedia.com
WEBMay 17, 2018 · In geologic time, the Ordovician Period, the second period of the Paleozoic Era, covers the time roughly 505 million years ago (mya) until 438 mya. The name Ordovician derives from that of the Ordovices, an ancient British tribe.