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guide fossil has 1 distinct synonym spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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
Synonyms, antonyms and the broader and narrower relations for guide fossil come from Princeton University’s WordNet. Full sources and licences.