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In a certain area of undisturbed layers of rock, fossils of horseshoe crabs may be found in the upper layer, and a lower layer contains fossils of trilobites. trilobites are extinct aquatic arthropods resembling modern horseshoe crabs. this information suggests that

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The above information suggests that trilobites are older than horseshoe crabs because they are found in a layer below the crabs and the rocks have been proved to be undisturbed. This satisfies the Law of Superposition. The fact that the horseshoe crabs are found in a younger layer than trilobites and that they resemble each other suggests that horseshoe crabs could have evolved from trilobites. 

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