| 单词 | ammonite |
| 释义 | ammonite noun[C] geologyspecializeduk/ˈæm.ə.naɪt/us/ˈæm.ə.naɪt/anextinctseacreature(= one that nolongerexists)oftenfoundas afossil(= ananimalturnedintorock), with aflat,spiralshell 菊石（鹦鹉螺的化石） LAWRENCE LAWRY/Science Photo Library/GettyImages Palaeontology & fossils
ammonite| American Dictionaryammonite noun[C] us/ˈæm·əˌnɑɪt/earth science anextinct(= nolongerexisting)seacreatureoftenfoundas afossil(=animalorplantpreservedinrock) Examplesofammoniteammonite This siltstone unit lies upon a conspicuous erosion surface highlighted by angular chips of phosphatized pebbles and ammonites. From theCambridge English Corpus The central part begins withammonite-bearing crinoidal limestones and black pillow basalts. From theCambridge English Corpus Cladistic techniques have been applied to many fossil groups but ammonites remain largely understudied in this way. From theCambridge English Corpus Detailed collecting through 15 sections across the basin has facilitated a major revision of theammonitezonation. From theCambridge English Corpus The fauna is limited to ammonites and a species of epifaunal bivalve. From theCambridge English Corpus This method can therefore be used to compare the morphological signal of ammonites with other physical or chemical signals. From theCambridge English Corpus We note, however, that ammonites have not been recorded from the 1.8 m of strata below the proposed boundary level. From theCambridge English Corpus The sudden appearance of these genera represents a major reinvasion of the basin by neocomitid ammonites. From theCambridge English Corpus Apart from ammonites and dinoflagellates, very little other stratigraphic data is discussed in detail. From theCambridge English Corpus Dashedammonite-zone and bed boundaries reflect some uncertainty of their precise position in the core. From theCambridge English Corpus Most of the ammonites studied have ribs, tubercles, keels and other ornaments. From theCambridge English Corpus Nektonic taxa such as belemnites and ammonites dominate the fauna, with lesser bivalves and brittle stars found almost exclusively in the coarser units. From theCambridge English Corpus No ammonites have been recorded from between -1.8 m to 0 m in the section. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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