Question

this diagram shows fossils in an undisturbed sedimentary rock sequence.
which of the following fossils is oldest? select the most likely answer.
turtle shell crab claw sea urchin

Explanation:

In undisturbed sedimentary rock sequences, the principle of superposition states that deeper rock layers (and the fossils within them) are older than shallower layers. The turtle shell fossil is in the deepest layer shown.

Answer:

turtle shell