Hard siliceous rock suitable for making millstones; spec. (frequently Millstone Grit) a coarse sandstone of the British Carboniferous, lying…
| 单词 | θ5379 |
| 释义 | the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > carboniferous spec. (5) millstone grit1682 Hard siliceous rock suitable for making millstones; spec. (frequently Millstone Grit) a coarse sandstone of the British Carboniferous, lying… tumbler-beds1821 plural, a local name for the loose crumbly upper portion of the carboniferous limestone. culm measures or series1836 Geology. (More fully culm measuresor series.) A name given by some geologists to a series of shales, sandstones, etc. containing, in places, thin… Mississippian1893 Geology. The Mississippian period or system of rocks (see sense B. 2). Pennsylvanian1902 Geology. With the. The Pennsylvanian period (see sense B. 2); the system of rocks dating from this time. |
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