Epoch Middle Ordovician Epoch

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

Marine life peaks in diversity (470-458.4 Ma).

470.00 Ma – 458.40 Ma · 11.60 Ma duration

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

Middle Ordovician Epoch 1

470 Ma First Coral Reefs Ordovician reef systems First significant coral-stromatoporoid reef systems in shallow Ordovician seas.