1) Geological period 2) Ordovician period 3) Period
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https://www.crosswordclues.com/clue/ordovician
The Ordovician ən is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between {Geologic Ages Inline|Ordovician} and {Geologic Ages Inline|Silurian} million years ago {ICS 2004}. It follows the Cambrian period and is followed by the Silurian period. The Ordovician, named after the Celtic tribe of the Ordovi...
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http://en.wikipedia.org/wiki/Ordovician
• (n.) The Ordovician formation. • (a.) Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
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http://thinkexist.com/dictionary/meaning/ordovician/
The second period of the Palaeozoic. Spans 510-443. The Ordovician is famous for its graptolite and trilobite-rich deposits, particularly in the UK. The Ordovician ended in a mass extinction, probably caused by an Ice Age.
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http://www.encyclo.co.uk/local/20206
The second earliest period of the Paleozoic era (after the Cambrian and before the Silurian), thought to have covered the span of time between 490 and 443 million years ago; also, the corresponding system of rocks. It is named after a Celtic tribe called the Ordovices. In the older literature the Ordovician is sometimes know as the Lower Silurian.
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http://www.encyclo.co.uk/local/22047
Or`do·vi'cian adjective [ From Latin
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. --
noun The Ordovician formation...
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http://www.encyclo.co.uk/webster/O/30
Geologic period that occurred roughly 438 to 505 million years ago. During this period, the first fish and fungi species appear.
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http://www.physicalgeography.net/physgeoglos/o.html
The Ordovician period was the fourth geological period, 375,000,000 years ago.
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http://www.probertencyclopaedia.com/browse/HO.HTM
a geological period lasting from 500 to 440 million years ago. See time table.
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http://www.seafriends.org.nz/books/glossary.htm
[
n] - from 425 million to 500 million years ago
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http://www.webdictionary.co.uk/definition.php?query=Ordovician
the period of geological time between 505 and 440 million years ago. The name comes from the Ordovices, a Celtic tribe which lived in Wales in the region where these rock units were first defined. See Geological Timescale
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https://www.encyclo.co.uk/local/20800
Ordovician period noun from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
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https://www.encyclo.co.uk/local/20974
The second earliest period of the Paleozoic era, spanning the time between 505 and 440 million years ago. It is named after a Celtic tribe called the Ordovices.
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https://www.encyclo.co.uk/local/21202
The period of time between 443 and 485 million years ago.
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https://www.encyclo.co.uk/local/23001
No exact match found.
