Answer:
Option (B)
Explanation:
The Grand Canyon is a large erosional landform formed by the agent water and are about 2 billion years old during the time of formation of the metamorphic as well as igneous rocks.
These canyons are formed due to the down-cutting of the rocks by the Colorado river water, which took place mostly about 6 to 7 million years back.
The rocks of this canyon were found to be comprised of a large number of fossil assemblages such as brachiopods, sponges, bryozoans, corals, sharks, fish, and other microfossils.
So far, there is no record of getting fossils of dinosaurs.
Thus, the correct answer is option (B).
