Oligocene Series

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Read about the Oligocene Series
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Cenozoic ErathemQuaternary_SystemTertiary_SystemHolocene SeriesPleistocene_SeriesPliocen SeriesMiocene SeriesOliocene SeriesEocene SeriesPaleocene SeriesCenozoic search.jpg
About this image

There are currently no known geologic units of Oliocene age in Illinois.