Gzhelian
Geologic period
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The Gzhelian is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the youngest stage of the Pennsylvanian, the youngest subsystem of the Carboniferous. The Gzhelian lasted from 303.7 to 298.9 Ma. Wikipedia
Occurred: 303.7 (+/- 0.1) million years ago - 298.9 (+/- 0.15) million years ago
Age: 303.7 million to 298.9 million years ago
Epoch: Pennsylvanian