| 释义 |
Callovian, a. Geol.|kæˈləʊvɪən|
Also Kellovian.
[ad. F. callovien (A. d'Orbigny Paléont. française. Terrains jurassiques (1842) I. 608), f. mod.L. Callovien-sis, f. Kellaways (given by d'Orbigny as Kelloway), a village in Wiltshire.]
Epithet of a stage of the Jurassic between the Oxfordian in the Upper Jurassic and the Bathonian in the Middle Jurassic. Also absol.
1881Q. Jrnl. Geol. Soc. XXXVII. 560 Near Bazinghen there is nothing but a few feet of clay between the Callovian grit with Terebratula humeralis (true) and Rhynchonella varians and the Nerinæan or so-called Astartian Oolite. 1885A. Geikie Text-bk. Geol. (ed. 2) 801 Oxfordian, divisible into (a) Callovian, with zones of Amm. macrocephalus, and A. anceps, and (b) Oxfordian, with zones A. Lamberti, A. Mariæ, A. cordatus. 1946W. J. Arkell in Bull. Geol. Soc. Amer. LVII. 8 Formerly, (1933) the present author maintained that the Callovian should comprise only the Kellaways beds of Kellaways, Wiltshire, and that the whole of the Oxford Clay of Oxford should be included in the Oxfordian; however, he has come to the conclusion that this would be wrong... The line of division should..be drawn between the Lamberti and the Mariae zones. 1955G. G. Woodford tr. Gignoux's Stratigr. Geol. vii. 338 The Callovian is a more or less calcareous or clayey sandstone. |