The generally slow and steady succession of species on Earth has been interrupted by:

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Episodes of mass extinction have interrupted the slow and steady succession of species on Earth by causing rapid and widespread loss of biodiversity, followed by periods of diversification and adaptive radiation. Examples of mass extinctions include the Permian-Triassic extinction event, which wiped out over 90% of marine species, and the Cretaceous-Paleogene extinction event, which ended the reign of the dinosaurs. Such mass extinctions have lasting effects on the composition and distribution of species and can take millions of years for ecosystems to recover.

The Generally Slow and Steady Succession of Species on Earth