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numerical ages for boundaries between time units on the geologic time scale primarily resulted from the study of ____________, in conjunction with relative age data

User Sheery
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Answer: Radiometric dating of igneous rocks

Explanation: Numerical ages for boundaries between time units on the geologic time scale primarily resulted from the study of radiometric dating of igneous rocks, in conjunction with relative age data.

(sorry if i'm wrong)

User Heavysixer
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