How would a geologist use absolute dating to determine the age of sedimentary layers?

Sedimentary rocks are made from older grains, so dating those grains usually does not reveal when the layer formed. A geologist can instead use absolute dating on igneous intrusions or extrusions near the sedimentary layer to constrain its age. The layer must be younger than an intrusion that cuts through it and older than an extrusion deposited above it, making choice B correct.

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