| 释义 |
Sequanian, a. Geol.|sɛˈkwɑːnɪən|
Also ‖ Sequanien.
[ad. F. Séquanien, f. L. Sēquani an ancient Celtic people of eastern Gaul: see -ian.]
Name of a substage of the Upper Jurassic in north-western Europe, below the Kimmeridgian; of or pertaining to this substage and the rocks that characterize it, and the geological age during which they were deposited.
1851[see Kimmeridgian a.]. 1881Q. Jrnl. Geol. Soc. XXXVII. ii. 571 De Loriol..wishes to call the Astartian and Corallian by one name, Sequanian. 1882A. Geikie Text-bk. Geol. 797 Corallien. Some authors take the upper part of this group into a separate section under the name of Sequanien, largely developed in the east of France, where it consists of massive limestones sometimes 400 feet thick. 1903Ibid. (ed. 4) II. 1156 The Oxfordian and Corallian divisions of the Jurassic system, or Callovian, Oxfordian, and Sequanian formations, are in general feebly represented in the Alpine region. 1970R. J. Small Study of Landforms iv. 145 The widely out-cropping Bathonian dolomite has been carved into a multitude of minor karstic forms which are overlooked by gently rounded hills of Sequanian limestone. |