| 释义 |
Turonian, a. Geol.|tjʊˈrəʊnɪən|
[= F. turonien, f. L. Turonēs: see prec. and -ian.]
Denoting a subdivision of the Cretaceous or Chalk period and series of strata, answering to the ‘Lower White Chalk without flints’ of English geologists.
1850Ansted Elem. Geol., Min. etc., Index, Turonian formation. [Ibid. §792 These beds are represented in France by the lower members of the ‘Terrain turonien’, which exhibit nearly the same peculiarities as in England, though to a somewhat greater extent.] 1885Geikie Text Bk. Geol. vi. ii. iii. §2 (ed. 2) 820 The Cretaceous system of Europe has been subdivided as follows:—Upper..Danian, Senonian, Turonian, Cenomanian, Gault. Lower..Neocomian. |