Question

The diagram below shows a stack of rock layers. Examine the diagram, and answer the question that follows. Layer R contains a well-known index fossil that is 100 million years old. Based on this information and the principle of superposition,

Answer 1

a Layers T and M are younger than 100 million years, and Layers X and G are older than 100 million years.
b Layers T and M are older than 100 million years, and Layers X and G are younger than 100 million years
c Layers T, M, X, and G are all younger than 100 million years