Category:Geologic formations in Iowa by geochronology

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Precambrian Phanerozoic formations in Iowa
Preceded by Proterozoic Eon
Paleozoic Era Mesozoic Era Cenozoic Era
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene 4ry