| 单词 |
Valanginian |
| 释义 |
Valanginian, a. Geol.|vælənˈdʒɪnɪən|
Also † Valenginian.
[ad. F. valanginien (E. Desor 1853, in Bull. de la Soc. des Sci. Naturelles de Neuchâtel III. 177), f. the name of the Château de Valangin, near Neuchâtel, Switzerland, in the vicinity of which are exposures of this series.]
Of, pertaining to, or designating a stratigraphical stage, a division of the Neocomian, which forms part of the Lower Cretaceous. Also absol.
1885A. Geikie Text-bk. Geol. (ed. 2) vi. 836 Valenginian—a group of limestones and marls. 1903Ibid. (ed. 4) II. vi. 1197 The lowest dark marl..indicates the emersion of these rocks at the close of the Jurassic period, and may represent the Valanginian stage. 1944Bull. Amer. Soc. Petroleum Geologists XXVIII. 1141 The lower member consists of..limestone and contains Valanginian ammonites. 1973Nature 23 Nov. 211/2 The age of the oldest magnetic lineations..is also coincident with the marine transgressions of southern Africa..and southern Argentina during the Upper Valanginian. 1978Ibid. 13 July 133/1 The fault activity of this tectonic phase lasted into Valanginian times. |
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