| 释义 |
parma2 Geol.|ˈpɑːmə|
(See quots.)
1888Encycl. Brit. XXIV. 4/1 The section [of the Urals] between the 64th and 61st parallels has..a wholly distinct character... From the broad plateaus, or parmas, which stretch towards the north-west, it might be conjectured..that the structure is more complicated. 1904Amer. Jrnl. Sci. CLXVIII. 469 This may mean that no true axis or ‘parma’ was in existence during Richmond time, but it does seem to show that the Wabash parma at least indicates the strike for the then highest land. 1904tr. Suess' Face of Earth I. ii. xii. 601 We see great folded chains merge with gradually flattening undulations into the similar foreland, where they form secondary folds, or ‘parmas’—this is the case in the Urals and the Appalachians. 1913A. W. Grabau Princ. Stratigr. xx. 808 Many of the low-dipping domes are perceptible as such only by the erosion which has removed their central portion, often leaving a topographic depression. Such low domes have also been called parmas. 1957Gloss. Geol. (Amer. Geol. Inst.) 212/2 Parma, a low dome or quaquaversal. |