Bartonian
Geologic time scale
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The Bartonian is, in the International Commission on Stratigraphy's geologic time scale, a stage or age in the middle of the Eocene Epoch or Series. The Bartonian Age spans the time between 41.2 and 37.71 Ma. It is preceded by the Lutetian and is... Wikipedia
Epoch: Eocene
Occurred: 41.2 million years ago - 37.8 million years ago
Age: between 41.2 and 37.71 Ma
Lower boundary definition: Not formally defined
Regional usage: Global (ICS)