| 单词 |
panfan |
| 释义 |
panfan Geomorphol.|ˈpænfæn|
[f. pan- + fan n.1]
= pediplain.
1915A. C. Lawson in Univ. California Publ. Geol. IX. iii. 33 The surface thus evolved is, in its ideal completion, wholly one of aggradation, a vast alluvial fan surface to which for convenience in discussion I propose to give the name panfan. 1931Jrnl. Geol. XXXIX. 138 Pediments are essentially compound graded flood plains excavated by ephemeral streams. As their growth corrodes the mountain mass they eventually coalesce to form smooth graded domes to which Lawson applied the term ‘panfan’..—a name that is etymologically unfortunate because these features are not concerned with alluvial fans at all. 1933Geol. Mag. LXX. 345 The rock-floors of the desert, known as pediments and panfans. 1954W. D. Thornbury Princ. Geomorphol. xi. 291 Lawson (1915) proposed the term panfan to designate ‘an end stage in the process of geomorphic development in an arid region in the same sense that the peneplain is an end stage of the general process of degradation in a humid climate’. He also recognized that both peneplains and panfans represent penultimate rather than ultimate stages of degradation. 1974[see pediplain]. |
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