Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any ancient remains of a plant or animal that lived during a specific geological period and that can be used to date the containing rocks.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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

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