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 - Wikipedia
WEBThe 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 443.8 Ma. [10] The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were ...
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 Period: Facts, Information, and Timeline - A-Z Animals
WEBJan 23, 2023 · Ordovician Period — Timeline The Ordovician Period is the second period of the Paleozoic Era (the first and longest era of the Phanerozoic eon). The era began about 541 million years ago with the Cambrian explosion, which saw the rise and diversity of many of earth’s organisms.
Ordovician Period Information and Facts - National Geographic
WEBLearn more about the time period that took place 488 to 443 million years ago. 3 min read. During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in...
Ordovician Period
WEB(Both of these events are described in the "Cambrian Period" pages found on the Geologic Timeline at left.) Together with the preceeding Cambrian Period, the Ordovician Period was known as the 'Age of Invertebrates'. Invertebrates are animals without backbones, such as snails and clams.
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 - University of California Museum of Paleontology
WEBThe Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 443 million years ago, with the beginning of the Silurian. At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana.
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.