| 释义 |
Pontian, a. Geol.|ˈpɒntɪən|
[ad. Russ. Ponticheskiĭ (N. Barbot de Marny Geol. ocherk' Khersonskoĭ Gubernii (1869) xiv. 106), f. as Pontic a.1: see -ian.]
Of, pertaining to, or designating the uppermost stage of the Miocene series in Europe (sometimes regarded as the lowest of the Pliocene series). Also absol.
1893P. Lake tr. Kayser's Text Bk. Compar. Geol. iv. 361 Congeria or Pontian series. 1895J. D. Dana Man. Geol. (ed. 4) iv. iv. 927 Above the Tortonian, the stages Sarmatian and Pontian are recognized in Dauphiné, Austria and Italy. 1903A. Geikie Text-bk. Geol. (ed. 4) II. 1291 The top of the Miocene series (Pontian stage). 1940A. W. Grabau Rhythm of Ages xxxviii. 466 The Pontian Hipparion clays, which were formerly considered in part Miocene, are here placed in the base of the Pliocene. 1971Nature 30 Apr. 562/1 In 1929, Matthew..pointing to the occurrence of a relatively primitive Hipparion fauna in the lower part of the stratotype Pontian at Sebastopol,..argued that the first appearance of Hipparion could thus be used to define the base of the Pliocene in continental mammalian successions. In this way, ‘early Pliocene’ and ‘Pontian’ became equivalent terms in vertebrate biostratigraphy. 1973Ibid. 15 June 391/1 Estimates by most vertebrate palaeontologists have ranged between 10–12 m.y. because of the supposed initial appearance of the three-toed Hipparion in the lower part of the stratotype Pontian of the eastern Mediterranean. |