单词 | tumbler-beds |
释义 | > as lemmastumbler-beds tumbler-beds n. plural, a local name for the loose crumbly upper portion of the carboniferous limestone. ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > carboniferous spec. millstone grit1682 tumbler-beds1821 culm measures or series1836 Mississippian1893 Pennsylvanian1902 1821 W. Forster Section of Strata (ed. 2) 103 About sixteen feet of the upper part of [the Great Limestone] is called the Tumbler Beds. < as lemmas |
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