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Mass Extinctions in the Marine Fossil Record

1982/03/19 by David M. Raup, J. John Sepkoski · 65 citations
Earth and Planetary Sciences · #Evolution and Paleontology Studies #Paleontology and Evolutionary Biology #Paleontology and Stratigraphy of Fossils

paper · doi:10.1126/science.215.4539.1501

openalex publication_date 1982/03/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

A new compilation of fossil data on invertebrate and vertebrate families indicates that four mass extinctions in the marine realm are statistically distinct from background extinction levels. These four occurred late in the Ordovician, Permian, Triassic, and Cretaceous periods. A fifth extinction event in the Devonian stands out from the background but is not statistically significant in these data. Background extinction rates appear to have declined since Cambrian time, which is consistent with the prediction that optimization of fitness should increase through evolutionary time.

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