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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.
the Ordovician Period or System.
Source: Dictionary.com



The Ordovician /ɔrdəˈvɪʃən/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 and 443.8 million ...

The Ordovician Period


The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago.* During this period, the area north  ...

Ordovician Period - National Geographic


Learn about the Ordovician period and get information, facts, and more about prehistoric periods from National Geographic.

The organisms are bizarre, thrilling things from the dawn of "higher life" that disappear from the record in later rocks. Except that now a similar body of younger rocks, of Ordovician age, has been found in Morocco bearing many Burgess-type organisms, still swimming a... More »
By Andrew Alden, About.com Guide

Ordovician extinctions


During the Ordovician Life expanded in diversity tremendously. There were extensive reef complexes in the tropics. The early Ordovician was thought to be quite ...

Ordovician Period | geochronology | Britannica.com


Sep 29, 2015 ... The Ordovician Period was also characterized by the intense diversification (an increase in the number of species) of marine animal life in what ...

Ordovician-Silurian extinction | Britannica.com


Sep 10, 2015 ... Global extinction event occurring during the Hirnantian Age (445.2 million to 443.8 million years ago) of the Ordovician Period and the ...

Palaeos Paleozoic : Ordovician : The Ordovician Period


The Ordovician Period is the second period of the Paleozoic Era. This important period saw the origin and rapid evolution of many new types of invertebrate ...

Ordovician - The Paleontology Portal


World Paleogeography and Paleoclimate: From the Early to Middle Ordovician, the earth experienced a milder climate. Siberia and Baltica were separate, and ...

Ordovician | Define Ordovician at Dictionary.com
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Popular Q&A
Q: How long was the Ordovician period.
A: About 44 million years. Read More »
Source: www.answers.com
Q: What was the weather the ordovician period?
A: Answer The weather in the Ordovician Era was very damp weather, but also, as the era continued, it grew relativley warm.The sudden change in weather caused mass... Read More »
Source: wiki.answers.com
Q: What are some of the Ordovician animals?
A: nautiloids. Read More »
Source: wiki.answers.com
Q: What are the plants of the Ordovician period.
A: The plants of the Ordivician consisted mostly of red and green algae. The first primitive land plants appeared during the Ordivician, though they did not resemb... Read More »
Source: www.answers.com
Q: What is the ordovician landscape?
A: All life on Earth was still in the sea. Plant life was just beginning to form and consisted of sponges, corals and even some primitive fish lived in Ordovician ... Read More »
Source: answers.yahoo.com