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Index fossil

An index fossil is a fossil that is found in rocks of only one geologic period and is therefore used to assign a date to any rock that it is found in.

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1904

... (+ 1967) May 6 - Harry Martinson, swedish author, winner of the Nobel Prize in literature May 11 - Salvador Dalí, artist May 17 - Jean Gabin[?], actor (+ 1976) ...