Geology. A major division of geological time; spec. one that is a subdivision of an epoch, corresponding to a stratigraphic stage.
| 单词 | θ5448 |
| 释义 | the world > the earth > structure of the earth > age or period > [noun] (87) age1813 Geology. A major division of geological time; spec. one that is a subdivision of an epoch, corresponding to a stratigraphic stage. group1829 Any of various categories into which rocks were formerly classified, corresponding to modern geological… A division corresponding to period, n.… period1833 Geology. A major division of geological time; (now) spec. one that is a subdivision of an era and is itself divided into epochs. aeon1879 Geology. Usually in form eon. A major division of geological time, often subdivided into eras. group1886 Any of various categories into which rocks were formerly classified, corresponding to modern geological… A division corresponding to age, n. 11; cf… moment1933 A definite unit of time. Geology. A period of geological time corresponding to a stratigraphical zone (as defined by its fossil content). Subcategories:— Pre-Cambrian (7) — primary or Palaeozoic (8) — secondary or Mesozoic (10) — tertiary or Cainozoic (9) — quaternary (5) — ice-age or glaciation (35) — other ages or periods (7) |
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