Discussion
The group which does not show a correct sequence of the geologic column is :
Answer: B
The group not in correct sequence is Devonian, Ordovician, Silurian, Permian.
The Palaeozoic periods run Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian. Putting the Devonian before the Ordovician and the Silurian reverses the order, so this group is wrong.
The other groups are correct: the Palaeogene and Neogene epochs run Palaeocene, Eocene, Oligocene, Miocene; the eras run Palaeozoic, Mesozoic, Cenozoic; and the Mesozoic periods run Triassic, Jurassic, Cretaceous.
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