Relating to or characteristic of eozoon; resembling or pertaining to the supposed earliest fossil organisms of the Eozoic era.
From 'eozoon' plus '-al', a common adjective suffix that turns nouns into adjectives describing something that belongs to or relates to that category.
While 'eozoonal' rocks are no longer considered to contain true fossils, studying them taught scientists how to distinguish real biological structures from mineral patterns—it was a valuable lesson in scientific skepticism.
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