A clast of granite found in a breccia is dated at 450 million years old. What can you conclude about the breccia?
A) The breccia is older than 450 million years.
B) The breccia is younger than 450 million years old.
C) The breccia was metamorphosed more than 450 million years ago.
D) The breccia was metamorphosed fewer than 450 million years ago.
E) You can't draw any conclusions.

Question

Quizplus · Accepted Answer

The clast of granite being dated at 450 million years old means that the granite was formed at that time. Since it is found within the breccia, the breccia must be younger. Therefore, option B is the correct choice, as the breccia is younger than 450 million years old.

A Clast of Granite Found in a Breccia Is Dated