A layer of stratigraphy in one location overwhelmingly represents one species, while the same species is discovered in a similar stratigraphic layer fifty miles away. What method is used to provide an estimate of age for this layer and this species?

Biostratigraphy

Explanation:

Whilst this question might have options I believe BIOSTRATIGRAPHY to be the answer.

Biostratigraphy is a branch of Stratigraphy that allows for the identification of fossils within layers of sedimentary rock and using them to determine the relative geological age of the rock.

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