Usage History of 'eocene'

The following chart shows how frequently 'eocene' appeared in printed materials over time. For example, the word 'eocene' occurred 2 times in books in 1728 and 25,354 times in 2008. From 1728 to 2008, the word 'eocene' was used a total of 1,324,290 times in books scanned by Google. See Reference: Google Ngram project.

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