Usually means: Indicator of specific geological period.
Definitions Related words Mentions
We found 10 dictionaries that define the word guide fossil:

General (9 matching dictionaries)
  1. guide fossil: Merriam-Webster
  2. guide fossil: American Heritage Dictionary of the English Language
  3. guide fossil: Vocabulary.com
  4. guide-fossil: Wordnik
  5. guide fossil: Dictionary.com
  6. guide fossil: Rhymezone
  7. guide fossil: FreeDictionary.org
  8. guide fossil: Mnemonic Dictionary
  9. guide fossil: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. guide fossil: Encyclopedia

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Definitions from WordNet (guide fossil)

▸ noun:  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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