| 释义 |
pediplain Geomorphol.|ˈpɛdɪpleɪn|
[f. pediment1 + plain n.1]
An extensive plain formed in a desert by the coalescence of neighbouring pediments (believed to represent a late stage in the cycle of erosion in arid and semi-arid climates). Cf. pediplane.
1935Maxson & Anderson in Jrnl. Geol. XLIII. 94 Widely extending rock-cut and alluviated surfaces of this type formed by the coalescence of a number of pediments and occasional desert domes may be called ‘pediplains’. 1968C. R. Twidale Geomorphol. xi. 308 Pediplains,..like peneplains, are surfaces of low relief, but generally differ from the latter in a number of respects. They are smoother, and less dissected.., they are mostly dominated by concave profiles, and meet the adjacent uplands in a piedmont angle. 1973[see pedimentation]. 1974C. H. Crickmay Work of River viii. 211 Where pediments are sufficiently extensive to be conjoint and broadly continuous, the whole is termed a pediplain or a panfan. 1977A. Hallam Planet Earth 190 The continents as a whole were, however, almost completely worn down to pedi⁓plains.
Hence ˈpediplained a.
1970R. J. Small Study of Landforms ii. 28 This is one of the explanations of the development, on the pediplained surfaces of South America, Africa and Australia, of very hard weathering crusts. |