| 单词 | index fossil |
| 释义 | > as lemmasindex fossil index fossil n. = guide fossil n. at guide n. Compounds 2. ΘΚΠ the world > life > biology > organism > fossil > [noun] > characteristic of specific strata index fossil1900 zone fossil1904 facies fauna1923 facies fossil1923 1900 C. R. Eastman tr. K. A. von Zittel Text-bk. Palaeontol. I. 4 Having determined the chronological succession of the clastic rocks by means of their super~imposition and their characteristic or index-fossils, they may be divided up into still smaller series. 1933 R. C. Moore Hist. Geol. xiv. 186 In precise correlation of fossil-bearing strata it is important to recognize and differentiate species that appear only in a given bed, or a short succession of beds, for the occurrence of the same species elsewhere points to equivalence in age of the containing strata. Such fossils may be termed index fossils. 1968 J. R. Beerbower Search for Past (ed. 2) viii. 207 Relatively few groups of organisms provide most of the index fossils. < as lemmas |
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