Author Question: Granitic pebbles with a radiometric age of 300 million years are embedded in a sedimentary rock. A ... (Read 78 times)

jeatrice · **on:** Jul 29, 2018

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
A) older than 300 million years.
B) younger than 200 million years.
C) between 200 and 300 million years old.
D) precisely 300 million years old.

Question 2

The isotope most useful for dating rocks from the late Pleistocene is

A) uranium-238.
B) uranium-235.
C) potassium-40.
D) carbon-14.