the Ordovician

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• Ordovician — Period 488.3–443.7 million years ago …   Wikipedia

• Ordovician radiation — The Ordovician radiation was the diversification of animal life at the start of the Ordovician period, just 40 million years after the Cambrian explosion.It followed a series of extinction events at the Cambrian Ordovician boundary, and the… …   Wikipedia

• Ordovician — [ôr΄də vish′ən] adj. [< L Ordovices, ancient Celtic tribe in Wales] [sometimes o ] designating or of the second geologic period of the Paleozoic Era, characterized by the development of abundant marine invertebrates and the first vertebrates… …   English World dictionary

• Ordovician — Or do*vi cian, a. [From L. Ordovices, a Celtic people in Wales.] (Geol.) Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. n. The Ordovician… …   The Collaborative International Dictionary of English

• Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …   Universalium

• Ordovician–Silurian extinction event — …   Wikipedia

• The Ozarks — Ozark redirects here. For other uses, see Ozark (disambiguation). Ozark Mountain redirects here. For the wine region, see Ozark Mountain AVA. The Ozarks, Ouachitas, Black Hills, and Sawtooths …   Wikipedia

• Ordovician — /awr deuh vish euhn/, Geol. adj. 1. noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish. See table at GEOLOGIC TIME. n. 2. the Ordovician Period or System.… …   Universalium

• Ordovician — Or•do•vi•cian [[t]ˌɔr dəˈvɪʃ ən[/t]] adj. 1) gel noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish 2) gel the Ordovician Period or System • Etymology: 1879;… …   From formal English to slang

• Ordovician — 1. adjective Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago. 2. noun The Ordovician period …   Wiktionary

• The Complete Guide to Prehistoric Life —   …   Wikipedia