"Ordovician" is a word in ENGLISH
The Ordovician formation.
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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A genus of trilobites found in the Lower Silurian formation. See Illust. in Append.
Read the complete definitionA series of limestone strata found in Ohio and farther west, presenting bluffs along the rivers and valleys, formerly supposed …
Read the complete definitionA series of strata in the lower Silurian formations of Great Britain; -- so named from Llandeilo in Southern Wales. …
Read the complete definitionA subdivision of the Niagara period in the American upper Silurian, characterized by the formations known as the Oneida conglomerate, …
Read the complete definitionA genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.
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