[Geology & Weather Reviews]

The diagram to the right represents a rock core drilled from a region consisting of only 4 sedimentary rock layers: A, B, C, and D.

11. Which layer should contain the oldest fossils?

a. Layer A

b. Layer B

c. Layer C

d. Layer D.

Answer: Layer A is the oldest rock layer (it's at the bottom). The oldest fossils would be found there. Layer D should be the youngest layer, even though it is in the middle. This is because Layers A-C were folded onto it.

---------- [Answer] ----------

Slichter