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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