Question

task: fossils
activity 3 of 4
the diagram below shows a geologic cross section.
which rock layer most likely contains fossils of the most recently evolved organisms?
a. 1
b. 2
c. 3
d. 4

Explanation:

In geological cross - sections, the principle of superposition states that in undisturbed sedimentary rock layers, the younger layers are on top of the older layers. So, the most recently evolved organisms (which would be in the youngest rock layer) are likely to be found in the uppermost layer.

Answer:

A. 1