Early Miocene
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The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene Epoch made up of two stages: the Aquitanian and Burdigalian stages.
The sub-epoch lasted from 23.03 ± 0.05 mya to 15.97 ± 0.05 mya (million years ago). It was preceded by the Oligocene epoch.