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Which unit of geologic time is the oldest

Which unit of geologic time is the oldest-example-1
User Namth
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From oldest to youngest, these are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. Note that in the United States, the Carboniferous is divided into two separate periods: the Mississippian and the Pennsylvanian. The seven periods of the Paleozoic era.


User Ranjeet Karki
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