Epoch Oligocene Epoch

Time runs left (older) → right (younger) · Hover a card for details

Antarctic ice sheet forms; grasslands expand (33.9-23.03 Ma).

33.90 Ma – 23.03 Ma · 10.87 Ma duration

Axis labels in Ma (millions of years ago) · Click a card for details

Oligocene Epoch 1

33.9 Ma – 33.7 Ma Antarctic Ice Sheet Forms Eocene-Oligocene transition Drake Passage opens; cold circumpolar current drives Antarctic glaciation.