Question

In the 1600's, Danish scientist Nicholas Steno studied the relative positions of sedimentary rocks. He determined that sedimentary rocks typically form layer on top of layer, so if undisturbed, the bottom layer of sedimentary rock is the oldest. Today, this idea is known as the Law of Superposition. This law is one way to estimate the relative ages of sedimentary rocks. The diagram below is a geologic cross-section from Ohio. How could the Law of Superposition be applied correctly to this cross-section?

Answer 1

A. The youngest sedimentary layer was deposited by glaciers.
B. The layers in this cross-section are all igneous, so it will not work
C. The sedimentary layer in this cross-section is close to 5,200 years old.
D. The youngest sedimentary layer can be found at the very bottom of the