| 单词 | bottom moraine |
| 释义 | > as lemmasbottom moraine bottom moraine n. gravel and other debris deposited from the underside of a glacier; ground moraine, subglacial till; (also) an instance of this. ΘΚΠ the world > the earth > structure of the earth > constituent materials > sediment or alluvium > [noun] > glacial bottom moraine1852 overwash1886 kettle moraine1889 outwash1905 1852 Amer. Jrnl. Sci. 64 55 The underlying masses of sand and gravel were considered as the remains of the bottom moraines. 1882 Nature 16 Mar. 470/1 The Devonian rocks..are covered with a thick sheet of typical bottom-moraine. 2009 Vegetation Hist. & Archaeobotany 18 454/1 The bottom moraine marks the passage of the last pre-Weichselian glacier. < as lemmas |
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