| 释义 |
▪ I. Valentian, a. Geol.|vəˈlɛntɪən|
[f. Valentia, name of a Roman province in S. Scotland + -an.]
Designating or pertaining to the earliest stratigraphical division of the Silurian in Britain, preceding the Wenlockian. Also absol.
1879C. Lapworth in Ann. & Mag. Nat. Hist. III. (table facing p. 455), Silurian system... Lower division (Valentian). 1880― in Ibid. V. 47 In the south of Scotland (Valentia)..three subformations are recognizable... Until geologists are willing to include the Tarannon in the Llandovery it will..be best to speak of this great Scottish formation and its equivalents as the Valentian formation, its three divisions, Lower, Middle, and Upper, representing respectively the Lower Llandovery, Upper Llandovery, and Tarannon of Wales and Siluria. 1921Q. Jrnl. Geol. Soc. LXXVII. 158 Some assistance in this comparison is afforded by the Valentian rocks of the Lake District. 1946[see Ludlovian a.]. 1974Encycl. Brit. Macropædia XVI. 774/2 The oldest interval, the Llandoverian (or Valentian), saw the beginning of a sharp distinction between basin graptolitic shale facies and calcareous..shelf facies.
▪ II. Valentian
variant of Valencian a. |