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Dated at 90 milllion years old, the fossils are the earliest evidence of a flying dinosaur.

Dated from 90 milllion years old, the fossils are the earliest evidence of a flying dinosaur.

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Dated at 90 milllion years old, the fossils are the earliest evidence of a flying dinosaur.

Dated from 90 milllion years old, the fossils are the earliest evidence of a flying dinosaur.

The participle "dated" idiomatically takes the preposition "at." The structure dated at [time] gives the age or time of occurrence of something.

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