英语词汇“k-t”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

K-T n. (also K/T, KT) Geology Cretaceous-Tertiary, used attributively with reference to: (a) the boundary between the Cretaceous period and the Palaeogene period (lower Tertiary), visible worldwide in the stratigraphic record and characterized by high levels of iridium thought to originate from an impacting asteroid; (b) a mass extinction of 65 million years ago associated with this boundary, during which the (non-avian) dinosaurs and many other species died out.The Tertiary is now not generally recognized as a single period, being divided into the Palaeogene and the Neogene. The boundary also marks the division between the Mesozoic era and the Cenozoic era.

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1981 Science 18 Dec. 1341/1 A strong Ir abundance anomaly at the palynological K-T boundary.

1985 New Scientist 8 Aug. 25/2 One characteristic..seemed to buffer certain groups of bivalves and gastropods against the effects of the K-T event, and that was the geographic extent of the whole group.

1991 Amer. Scientist Mar. 172/3 The brimstone that helped demolish Sodom and Gomorrah could have caused the Permotriassic and K-T extinctions as well.

1993 Sci. News 3 Apr. 213/1 Zircon crystals found in K-T sediments from Colorado.

1997 Micropaleontology 43 286/1 The occurrence of intact coccospheres in a clay layer probably at least some 20 cm above the K/T boundary..would suggest that these species..survived the boundary event(s).

2002 Advertiser (Adelaide) (Nexis) 31 Jan. 25 The so-called KT impact which killed off the dinosaurs.

单词	k-t
释义	> as lemmas K-T K-T n. (also K/T, KT) Geology Cretaceous-Tertiary, used attributively with reference to: (a) the boundary between the Cretaceous period and the Palaeogene period (lower Tertiary), visible worldwide in the stratigraphic record and characterized by high levels of iridium thought to originate from an impacting asteroid; (b) a mass extinction of 65 million years ago associated with this boundary, during which the (non-avian) dinosaurs and many other species died out.The Tertiary is now not generally recognized as a single period, being divided into the Palaeogene and the Neogene. The boundary also marks the division between the Mesozoic era and the Cenozoic era. ΚΠ 1981 Science 18 Dec. 1341/1 A strong Ir abundance anomaly at the palynological K-T boundary. 1985 New Scientist 8 Aug. 25/2 One characteristic..seemed to buffer certain groups of bivalves and gastropods against the effects of the K-T event, and that was the geographic extent of the whole group. 1991 Amer. Scientist Mar. 172/3 The brimstone that helped demolish Sodom and Gomorrah could have caused the Permotriassic and K-T extinctions as well. 1993 Sci. News 3 Apr. 213/1 Zircon crystals found in K-T sediments from Colorado. 1997 Micropaleontology 43 286/1 The occurrence of intact coccospheres in a clay layer probably at least some 20 cm above the K/T boundary..would suggest that these species..survived the boundary event(s). 2002 Advertiser (Adelaide) (Nexis) 31 Jan. 25 The so-called KT impact which killed off the dinosaurs. extracted from Kn. < as lemmas
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