In a sequence of rock layers we find trilobite fossils at the bottom of rock layer 1 and dinosaur fossils directly above the fossil trilobites in layer 2. There are inclusions of trilobites in layer 2. We conclude that
A) dinosaurs were extinct long before trilobites came into existence.
B) dinosaurs are from the Cambrian Period.
C) by inclusion and faunal succession, layer 1 is older than layer 2.
D) there is no time gap between the rocks.
Answer: C
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