| 释义 |
Ordovician, a. Geol.|ɔːdəʊˈvɪʃ(ɪ)ən|
[f. L. Ordovic-es, name of an ancient British tribe in North Wales + -ian.]
Of, pertaining to, or designating the second earliest period of the Palæozoic era, following the Cambrian and preceding the Silurian. Also absol., the Ordovician period or its rocks.
1879C. Lapworth in Geol. Mag. Decade II. VI. 14 The whole of the great Bala district where Sedgwick first worked out the physical succession among the rocks of the intermediates or so-called Upper Cambrian or Lower Silurian system..lay within the territory of the Ordovices; a tribe as undaunted in its resistance to the Romans as the Silures... Here, then, we have the hint for the appropriate title for the central system of the Lower Palæozoics. It should be called the Ordovician System. 1887Athenæum 29 Jan. 163/3 Mr. Jukes-Browne..gets over the difficulty of nomenclature by adopting Prof. Lapworth's name of ‘Ordovician’ for the ‘Lower Silurian’ of Murchison. 1888Daily News 24 Sept. 6/2 Strata representing ordovician, silurian, and carboniferous times. 1902A. J. Jukes-Browne Student's Handbk. Stratigr. Geol. viii. 118 In Ayrshire..the Ordovician has the ordinary facies of a formation accumulated at no great distance from a continental coast-line. 1955Times 4 June 8/5 It is a site of great geological interest for its variety of Ordovician volcanic lavas, with intrusive igneous rocks interbedded with fossiliferous mudstones and slates. 1967D. H. Rayner Stratigr. Brit. Isles iv. 80 In the British Isles the first fragmental remains of vertebrates are known from the Silurian beds, although bony plates have been found in the Ordovician of the United States. |