| 释义 |
Tithonian, a. Geol.|taɪˈθəʊnɪən|
[ad. G. tithonisch (A. Oppel 1865, in Zeitschr. der deutsch. geol. Ges. XVII. 535), f. L. Tīthōnus, Gr. τιθωνός: see -ian.]
Designating a stage of the European Upper Jurassic, thought to correspond to the Portlandian, or the Portlandian and part of the Kimmeridgian, in Britain; also ellipt.
1871Q. Jrnl. Geol. Soc. XXVII. 208 The deposition of the Wealden strata..commenced before the close of the Oolitic period; it continued during the whole of the Tithonian. 1882A. Geikie Text-bk. Geol. 800 At the top of the Alpine Jurassic series an important group of deposits occurs to which the name of Tithonian stage was given by Oppel. 1975Nature 13 Mar. 108/1 Two different directions have been obtained from sediments in the lower and upper parts of the Morrison formation (Kimmeridgian–Tithonian respectively). |