index fossil


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index fossil

n.
The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. Also called guide fossil.

index fossil

n
(Geological Science) a fossil species that characterizes and is used to delimit a geological zone. Also called: zone fossil

in′dex fos`sil


n.
a widely distributed fossil, of narrow range in time, regarded as characteristic of a given geological formation and used esp. in determining the age of related formations.
[1895–1900]

index fossil

- One useful for dating and demonstrating the relation between strata in which it is found.
See also related terms for useful.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.index fossil - a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is foundindex fossil - a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
fossil - the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
References in periodicals archive ?
This extends the geographic range of this Gulf Coast index fossil west from Mississippi to Texas.
I even found a tiny index fossil the paleontologists said was really important.
However, the position of the SDB within the section remains contentious because of the absence of the index fossils found in the Klonk Section, the Global Stratotype Section and Point (GSSP) (Zhao & Zhu 2014).