| 释义 |
Frasnian, a. Geol.|ˈfræznɪən|
Formerly also -ien.
[ad. F. Frasnien (J. Gosselet 1879, in Ann. Soc. géol. du Nord VI. 396), f. Frasne, var. Frasnes, name of a village and commune in southern Belgium.]
Name of the lower of the two stages constituting the Upper Devonian in Europe; of or pertaining to this stage or the geological period during which it was deposited. Also absol.
1882A. Geikie Text-bk Geol. 701 In the Belgian and Eifelian tracts they have been subdivided as under:..Fammenien..Frasnien. 1894Geol. Mag. Oct. 474 The Frasnien series in the North of France and Belgium. 1963D. W. & E. E. Humphries tr. Termier's Erosion & Sedimentation xiii. 288 The Frasnian reefs on the edge of the Dinant basin. Ibid. 289 The bioherms of the Frasnian form a subsidising series up to 1,300 feet thick. |