| 单词 | index fossil |
| 释义 | index fossil noun[C] geologyspecializeduk/ˈɪn.deks ˌfɒs.əl/us/ˈɪn.deks ˌfɑː.səl/afossilthat isfoundin manyplacesand comes from the sametimeinhistory, so thatscientistscan use it todecidehowoldcertainrocksare 标准化石Palaeontology & fossils
index fossil| American Dictionaryindex fossil noun[C] us/ˈɪn·deks ˌfɑs·əl/earth science afossilthat isfoundin manyplacesand comes from the sametimeinhistory, so thatscientistscan use it todecidehowoldcertainrocksare Examplesofindex fossilindex fossil It has a cosmopolitan distribution and is an importantindexfossilin biostratigraphy. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.It is used in biostratigraphy as anindexfossil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The series of deposits that spans the occurrence of a particularindexfossil, is often referred to as that fossil's zone, enabling to relate different faunas through time. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Firstly, index fossils should be temporally restricted, numerically abundant and spatially widespread. From theCambridge English Corpus Apart from conodonts, goniatites are the best index fossils, which have considerably completed the biostratigraphic calibration of our sections. From theCambridge English Corpus An absence of facies bias potentially increases the usefulness of these taxa as index fossils, but their global utility is restricted by their endemism (see above). From theCambridge English Corpus Because certain fossils are solely found in certain layers, they are referred to as index fossils. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Such index fossils must be distinctive, be globally distributed and have a short time range to be useful. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Such index fossils must be distinctive, be globally distributed and occupy a short time range to be useful. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Misleading results are produced if the index fossils are incorrectly dated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Some flood geologists dispute geology's assembled global geologic column since index fossils are used to link geographically isolated strata to other strata across the map. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Fossils are often dated by their proximity to strata containing index fossils whose age has been determined by its location on the geologic column. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Index fossils are more helpful in providing geologic references or reference markers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.They have been recorded from every continent and many are used as zonal or index fossils. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.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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