| 释义 |
esker Geol.|ˈɛskə(r)|
Also 9 escar, eskar, -ir.
[a. Ir. eiscir.]
‘The name given in Ireland to the elongated and often flat-topped mounds of post-glacial gravel which occur abundantly in the greater river-valleys of that country’ (Page); (not now restricted to Ireland or to Irish usage). Also in comb., as esker-like.
1852E. Forbes in Wilson & Geikie Life xiv. 505 The top of Headon Hill is capped by a great esker of gravel. 1865Page Hand-bk. Geol., Eskirs or Escars. 1882Geikie Text-bk. Geol. vi. v. i. §1. 892 Ridges, known in Scotland as kames, in Ireland as eskers, and in Scandinavia as ösar. 1882O'Donovan Merv Oasis I. iii. 55 Towards sunset we neared the flank of a long escar-like sand ridge. 1917Nature 2 Aug. 441/2 He considers that the ice-barrier tongues from the Antarctic glaciers are afloat and do not rest on esker-like embankments built of their moraines and subglacial gravels. 1955Sci. Amer. Sept. 85 Winding across the center [of the Tasnuna Valley, Alaska] is an esker, a narrow ridge of gravel left by a stream that ran through the glacier. 1966Times 28 Feb. (Canada Suppl.) p. xvi/2 Frozen lakes, eskers and beaches permit the landing of heavily loaded machines for six months of the year. |