单词 | roche moutonnée |
释义 | roche moutonnéen. Physical Geography. A bare rock outcrop or rocky hillock which has been elongated and shaped by glacial erosion, characteristically smoothed and rounded by abrasion and often also displaying one side (the downstream side) which is rougher and steeper as a result of plucking (cf. pluck v. 1b). Cf. moutonnée adj., also sheep-back n. at sheep n. Compounds 2, whaleback n. 3(a). ΘΚΠ the world > the earth > structure of the earth > structural features > rock formations > [noun] > roche moutonnée roche moutonnée1841 sheep-back1877 whaleback1913 1841 E. Hitchcock Elem. Geol. (ed. 2) vi. 173 The surfaces assume that peculiar rounded and undulating appearance denominated by Saussure, Roches moutonnees. 1841 E. Hitchcock Final Rep. Geol. Massachusetts I. i. 11 The fact that the roches moutonnées are rounded only upon their northwestern side, shows that the force which has produced these effects had a southeasterly direction. 1843 J. D. Forbes Trav. Alps of Savoy iii. 53 The surface of rock..is even and rounded, often dome-shaped or spheroidal, showing the structure of the rock in section... Such surfaces were called Roches Moutonnées by De Saussure. 1862 Q. Jrnl. Geol. Soc. 18 187 For many miles in the Alb Valley, both above and below St. Blasien, roches moutonnées stand like islands through the alluvium. 1872 W. S. Symonds Rec. Rocks ii. 23 At a point close to the road..is a roche moutonnée. 1935 Discovery Mar. 79/2 Dome-like rocks are exposed which in appearance recall the ice-formed roches moutonnées. 1977 A. Hallam Planet Earth 86/3 Many valleys are very deeply incised, with U-shaped cross-profiles and floors composed of smoothed, striated and streamlined rock hummocks (called roches moutonnées). 2001 Canad. Geographic May 72/1 Among its holdings is tiny Mermaid Island, home to a roche moutonnée bedrock hillock formed when a retreating glacier dumped debris. Derivatives ˌroche-mouˈtonnéed adj. rare characterized by roches moutonnées. ΚΠ 1876 Geol. Mag. 2nd Decade 3 28 The edges of these..bear the characteristic roches moutonnéed aspect. 1905 Bull. Geol. Soc. Amer. 16 51 The northern slopes..have been considerably smoothed by ice action... The whole surface is rochemoutonnéed, especially on the north, where nearly all rocks are absolutely fresh. 1942 C. A. Cotton Climatic Accidents Landscape-making xviii. 250 Glacially terraced slopes..afford a distinct variant of the roche-moutonnéed and mammillated type of ice-worn surface. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < |
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