| 释义 |
Ludlovian, a. Geol.|lʌdˈləʊvɪən|
[f. Ludlovia, med.L. name of Ludlow, town in Salop (Shropshire) in the vicinity of which are exposures of this series: see -ian.]
Of, pertaining to, or designating the latest of the three divisions of the Silurian, preceding the Downtonian (or the second latest, if the Silurian is taken to include the Downtonian). Also absol.
1855J. Phillips Man. Geol. vi. 104 This stage contains no less than seventy-eight species—the genera being mostly Wenlockian and Ludlovian. 1946L. D. Stamp Britain's Struct. xii. 109 Though various divisions of the Silurian have been proposed the old three-fold one into: (3) Ludlow Series or Ludlovian; (2) Wenlock Series or Wenlockian; (1) Llandovery Series or Valentian; has stood the test of time and is most convenient. 1969Bennison & Wright Geol. Hist. Brit. Isles vi. 121 There is..an almost perfect transition in the Welsh Borders from the Ludlovian into the Dittonian reflecting a gradually changing environment from marine to non-marine. Ibid. 120 Monograptus scanicus suggests a low Ludlovian age for these deltaic deposits. |