| 单词 | pond marl |
| 释义 | > as lemmaspond marl pond marl n. Geology an earthy or calcareous deposit formed at the bottom of ponds. ΚΠ 1869 Ann. Rep. Commissioner Agric. 1868 369 in U.S. Congress. Serial Set (40th Congr., 3rd Sess.: House of Representatives Executive Doc.) XV These accumulate as in the case of the testacea, and like the calcareous pond marls are both fossil and recent. 1974 Current Anthropol. 15 373/2 Lateral facies including pond marls rich in plant casts and impressions. < as lemmas |
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