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1 cretaceous
cretaceous [krɪ'teɪʃəs]1 noun∎ the Cretaceous le crétacécrétacé►► the Cretaceous period le crétacé -
2 cretaceous
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3 мел
мел
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[ http://www.eionet.europa.eu/gemet/alphabetic?langcode=en]EN
chalk
A soft, pure, earthy, fine-textured, usually white to light gray or buff limestone of marine origin, consisting almost wholly (90-99%) of calcite, formed mainly by shallow-water accumulation of calcareous tests of floating microorganisms (chiefly foraminifers) and of comminuted remains of calcareous algae (such as cocoliths and rhabdoliths), set in a structureless matrix of very finely crystalline calcite. The rock is porous, somewhat friable, and only slightly coherent. It may include the remains of bottom-dwelling forms (e.g. ammonites, echinoderms, and pelecypods), and nodules of chert and pyrite. The best known and most widespread chalks are of Cretaceous age, such as those exposed in cliffs on both sides of the English Channel. (Source: BJGEO)
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Русско-французский словарь нормативно-технической терминологии > мел
См. также в других словарях:
the Cretaceous — UK [krɪˈteɪʃəs] US noun science the period from about 144 to 65 million years ago when rock containing chalk was formed http://www.macmillandictionary.com/med2cd/weblinks/cretaceous the.htm Thesaurus: time before history was written downhyponym … Useful english dictionary
the Cretaceous — UK [krɪˈteɪʃəs] / US noun science the period from about 144 to 65 million years ago when rock containing chalk was formed Derived word: Cretaceous adjective … English dictionary
Cretaceous — Period 145.5–65.5 million years ago … Wikipedia
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Cretaceous-Tertiary boundary — Cre*ta ceous Tert i*ar*y boun da*ry (kr[ e]*t[=a] sh[u^]s), n. a thin layer of geologic deposits, of varying thickness in different parts of the world, found between the geological strata identified as Cretaceous and the strata above, identified… … The Collaborative International Dictionary of English
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cretaceous — [kri tā′shəs, krētā′shəs] adj. [L cretaceus < creta: see CRAYON] 1. Now Rare containing, composed of, or having the nature of, chalk 2. [usually C ] designating or of the third and last geologic period of the Mesozoic Era, characterized by the … English World dictionary
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cretaceous — 1670s, adj., chalky, from L. cretaceus chalk like, from creta chalk. As a geological period (with a capital C ), it was first used 1832. The extensive chalk beds of southeastern England were laid down during the Cretaceous … Etymology dictionary