The oldest radiometric date reported for an individual mineral grain from a sedimentary rock is approximately _____.
A)4)4 billion years
B)4)56 billion years
C)4)4 million years
D)4)56 million years

Question

Quizplus · Accepted Answer

The oldest radiometric date reported for an individual mineral grain from a sedimentary rock is approximately 4.4 billion years. This age was determined for a zircon grain found in sedimentary rocks in Western Australia, indicating the presence of continental crust and water on Earth's surface at that time.

The Oldest Radiometric Date Reported for an Individual Mineral Grain