Granitic pebbles with a radiometric age of 300 million years are embedded in a sedimentary rock.A dike,dated at 200 million years,intrudes into the sedimentary rock.With all this information we can estimate the age of the sedimentary rock to be

Question

Quizplus · Accepted Answer

The granitic pebbles with a radiometric age of 300 million years are older than the sedimentary rock they are embedded in. Therefore, the sedimentary rock must be younger than 300 million years old.

The dike that intrudes into the sedimentary rock is dated at 200 million years old, which means that the sedimentary rock must be older than the dike. Therefore, the sedimentary rock must be younger than 200 million years old.

Combining these two pieces of information, we can conclude that the age of the sedimentary rock is between 200 and 300 million years old.

Granitic Pebbles with a Radiometric Age of 300 Million Years