Lexic.us

Definition of Ordovician period

1. Noun. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.

Lexicographical Neighbors of Ordovician Period

Literary usage of Ordovician period

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)
"It has been seen that during the Cambrian period, so far as North America is concerned, the sea slowly encroached on the land. During the ordovician period ..."

2. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1905)
"During the ordovician period which followed, the climax of the transgression was reached, and an epicontinental sea (Vol. I, p. 11) stood over much of the ..."

3. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1906)
"During the ordovician period which followed, the climax of the transgression was reached, and an epicontinental sea (Vol. I, p. 11) stood over much of the ..."

4. A College Text-book of Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1909)
"Sedimentation During the ordovician period The conditions of sedimentation during the ordovician period were somewhat different from those of the Cambrian. ..."

5. Elements of Geology by Eliot Blackwelder, Harlan Harland Barrows (1911)
"CHAPTER XIV THE ordovician period Expansion of the sea in North America. — By the end of the Cambrian period the sea had overspread the greater part of ..."

6. Physical Features of the Des Plaines Valley by James Walter Goldthwait (1909)
"The ordovician period.—During the next geologic period, the Ordo- vician, the interior sea continued to expand, though local and temporary oscillations of ..."

7. An Introduction to Historical Geology: With Special Reference to North America by William John Miller (1916)
"Also the disturbance doubtless began before the close of the ordovician period. This is borne out by the fact that, for example, in central New York a ..."

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