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单词 tumbler-beds
释义

> as lemmas

tumbler-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.
extracted from tumblern.
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as lemmas
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