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Ordovician

en.wikipedia.org/wiki/Ordovician

The Ordovician 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 years ago.

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

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 Period | geochronology | Britannica.com

www.britannica.com/science/Ordovician-Period

Sep 29, 2015 ... 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 ...

Ordovician

www.scotese.com/newpage1.htm

During the Ordovician ancient oceans separated the barren continents of Laurentia, Baltica, Siberia and Gondwana. The end of the Ordovician was one of the ...

Ordovician: Ordovician Climate and Plate Tectonics

paleobiology.si.edu/geotime/main/htmlversion/ordovician4.html

Ordovician Climate and Plate Tectonics During the Ordovician, tectonic activity occurred in New England and the British Isles as North America moved toward ...

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 ...

Ordovician - The Paleontology Portal

paleoportal.org/index.php?globalnav=time_space§ionnav=period&period_id=15

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

Environment of the Ordovician Period

members.wolfram.com/jeffb/Fossils/drift.shtml

Ordovician Environment. During the Ordovician Period, the surface of the earth was dramatically different than it is today. Nearly all life on earth was in the ...

Answers
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
dictionary.reference.com/browse/Ordovician
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