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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

index fossil

n
(Geological Science) a fossil species that characterizes and is used to delimit a geological zone. Also called: zone fossil
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

index fossil

- One useful for dating and demonstrating the relation between strata in which it is found.
See also related terms for useful.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
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).
Ammonites are excellent index fossils, meaning it is often possible to link the rock layer in which a particular species is found to specific geological time periods.
The fossil bones belong to ancestors of our modern baleen whales and their age was determined using so-called co-occurring index fossils.