| 单词 |
retreatal |
| 释义 |
retreatal, a.|rɪˈtriːtəl|
[f. retreat v.1 + -al.]
Of or pertaining to the contraction and retreat of ice sheets and glaciers.
1896Amer. Geologist XVIII. 156 The stages of retreatal deposits ending in Greenwich cove illustrate the shrinkage and final disappearance of a tongue of the ice. Ibid. 160 (heading) Retreatal formations on the central and eastern shores of the bay. 1937Geogr. Jrnl. XC. 233 Most of this erosion occurred during the maximum stage of glaciation and very little during the retreatal stages. 1937Wooldridge & Morgan Physical Basis of Geogr. xxii. 378 Retreatal stages of the ice in the valleys are marked by ‘stadial moraines’. 1968R. W. Fairbridge Encycl. Geomorphol. 327/1 Bergdahl (1963) has recently published a series of studies on the Närke plain where estuarine clays from the Baltic progressively overlap closely spaced ridges of retreatal moraines, each winter season being marked by another ridge, at 170–280 meter intervals. |
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