The Late Ordovician mass extinction

With 26% of the marine families, up to 60% of the genera and an estimated 85% of all the species becoming extinct, the Late-Ordovician mass extinction was one of the most severe extinction episodes in the Phanerozoic, surpassed in its magnitude only by the end-Permian mass extinction. Its extent was global, and it affected nearly all benthic and pelagic groups (Hallam and Wignall 1997; Brenchley 2001; Sheehan 2001b; O Figure 16.7)

Late Ordovlcian (Ashgill)

Early Silurian (Llandovery)

Rawtheyan

Himantian

RhutWarian

Aeronian

Telychian

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