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The diagrams below show fossils in undisturbed layers of sedimentary rock.

Which diagram best represents a mass extinction event in the fossil record?
Choose 1 answer:
Choose 1 answer:
(Choice A) A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains three fossils. The deeper rock layer contains two fossils.
A
A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains three fossils. The deeper rock layer contains two fossils.
(Choice B) A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains two fossils. The deeper rock layer contains nine fossils.
B
A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains two fossils. The deeper rock layer contains nine fossils.
(Choice C) A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains nine fossils. The deeper rock layer contains two fossils.
C
A diagram shows two rock layers, one shallower and one deeper. The shallower rock layer is on top of the deeper rock layer. The shallower rock layer contains nine fossils. The deeper rock layer contains two fossils.

The diagram that best represents a mass extinction event in the fossil record is Choice C. This is because the shallower rock layer contains nine fossils, while the deeper rock layer contains only two fossils, indicating a significant decrease in the number of fossils present in the more recent layer. This suggests a sudden and widespread extinction event that affected many species.