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Definition of Ordovician
1. Noun. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.
Group relationships: Paleozoic, Paleozoic Era
Generic synonyms: Geological Period, Period
Definition of Ordovician
1. 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.
Definition of Ordovician
1. Adjective. (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago. ¹
2. Proper noun. (geology) The Ordovician period. ¹
¹ Source: wiktionary.com
Medical Definition of Ordovician
1.
Lexicographical Neighbors of Ordovician
Literary usage of Ordovician
Below you will find example usage of this term as found in modern and/or classical literature:
1. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1905)
"THE Ordovician PERIOD. older formations during the process of their decay, ...
While the rocks of the Ordovician system were as widely distributed as the ..."
2. Bulletin by Tennessee Division of Geology, Geological Survey, Division of Geology, Tennessee (1913)
"The lowest or oldest is the Tellico sandstone, of Ordovician age; the next and
most important is the "Rockwood" formation, of Silurian age; and the latest, ..."
3. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1905)
"Associated with the Upper Ordovician shales, there are considerable bodies of
... It is perhaps worthy of note that all the Ordovician formations of the ..."
4. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1907)
"The Upper Ordovician Fauna.—The closing fauna of the Ordovician in North ...
The closing phase of the Upper Ordovician was the withdrawal of the fauna of ..."
5. An Introduction to Historical Geology: With Special Reference to North America by William John Miller (1916)
"In 1879 Lapworth proposed to divide the remaining Silurian system into two parts,
the lower portion to be called Ordovician, and the upper to retain the ..."
6. The Encyclopedia Americana: A Library of Universal Knowledge (1919)
"The fauna of the Ordovician, or age of graptolites, shows a marked advance in
... The Ordovician trilobites present considerable advance over their Cambrian ..."
7. An Introduction to Geology by William Berryman Scott (1907)
"CHAPTER XXVII THE Ordovician (OR LOWER SILURIAN) PERIOD Ordovician SYSTEM WALES
... The classification and subdivision of the American Ordovician were first ..."
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