| 单词 | valley train |
| 释义 | > as lemmasvalley train valley train n. Physical Geography a deposit of glacial outwash along a valley bottom. ΘΚΠ the world > the earth > structure of the earth > structural features > deposited by water, ice, or wind > [noun] > glacial trail1866 valley train1892 sandr1893 ice contact1896 postglacial1928 boulder-train1967 1892 Ann. Rep. State Geologist 1891 (Geol. Survey New Jersey) 96 The drift thus deposited in a valley has sometimes been called a valley train of sand and gravel. 1954 W. D. Thornbury Princ. Geomorphol. xv. 377 Study of the valley trains extending down from the Alps led Penck and Brückner to a recognition of four stages of glaciation. 1974 Encycl. Brit. Micropædia VII. 636/3 When confined within valley walls, the outwash deposit is known as a valley train. < as lemmas |
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