Web Results
Or·do·vi·cian
[awr-duh-vish-uhn]
ADJECTIVE
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.
NOUN
2.
the Ordovician Period or System.
Source: Dictionary.com
Ordovician | Define Ordovician at Dictionary.com
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Ordovician - Wikipedia

en.wikipedia.org/wiki/Ordovician

The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.2 million years from the end of the ...

The Ordovician Period

www.ucmp.berkeley.edu/ordovician/ordovician.php

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, Ordovician Period Information, Prehistoric Facts ...

science.nationalgeographic.com/science/prehistoric-world/ordovician/

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

Ordovician Period | geochronology | Britannica.com

www.britannica.com/science/Ordovician-Period

Sep 29, 2015 ... Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, ...

Ordovician

earth.usc.edu/~stott/Catalina/Ordovician.html

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 Fossils - The Virtual Fossil Museum

www.fossilmuseum.net/Paleobiology/OrdovicianFossils.htm

Ordovician Life Metazoan invertebrates dominated Ordovician life. While far less famous than the Cambrian Explosion, the Ordovician encompassed a massive ...

Palaeos Paleozoic : Ordovician : The Ordovician Period

palaeos.com/paleozoic/ordovician/ordovician.htm

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 ...

BBC Nature - Ordovician period videos, news and facts

www.bbc.co.uk/nature/history_of_the_earth/Ordovician

During the Ordovician, a few animals and plants began to explore the margins of the land, but nothing colonised beyond these beachheads, so the majority of ...