Post‐Permian Radiation

Abstract

Events at the close of the Permian Period, led to the most severe mass extinction of the Phanerozoic. Sepkoski's ‘Palaeozoic Fauna’ suffered most; the surviving groups, more ‘modern’ in aspect, were those that would seed the post‐Permian radiation. This radiation has long been identified as a ‘delayed’ radiation, being apparently of longer duration than other post‐extinction radiations, although recent advances in radiometric dating have shortened the Early Triassic. Comparing rates of recovery between different groups or regions is not straightforward because the quality of the fossil record is rather poor during the Early Triassic. The analysis of trace fossils provides one approach to assessing ecological recovery in the absence of well‐preserved shells. Groups that radiated into vacant or largely vacated ecospace include the bivalves, which colonised deeper infaunal habitats; the Scleractinia which replaced the Palaeozoic reef‐building metazoans; and the reptiles that became top marine predators.

Key Concepts:

  • The Late Permian mass extinction event is the most severe extinction event known from the fossil record.

  • Late Permian global warming led to a reduction in ocean circulation, increased ocean stratification and expansion of low‐oxygen ‘dead zones’.

  • The Palaeozoic fauna is dominated by sessile, epifaunal filter‐feeders such as corals, crinoids and brachiopods, whereas the Modern fauna is dominated by motile, epifaunal and infaunal organisms such as bivalves, echinoids and gastropods.

  • The best‐preserved fossil remains usually require an absence of scavenging animals, rapid burial and rapid mineralisation.

  • The quality of the fossil record is not constant through time and is affected by a number of different sampling and preservational factors.

  • Trace fossils provide evidence of the activities of benthic organisms that may not be preserved as body fossils, and are the only records of the responses of these animals to past extinction events.

Keywords: Permian; Triassic; extinction; radiation; ecospace; Lazarus effect

Figure 1.

Stratigraphy of the Permian–Triassic interval. Arrows indicate major extinction events.

Figure 2.

Generic diversity of marine gastropods through the Permian–Triassic interval. Dashed line shows the number of taxa that occur as fossils. Dotted line shows the number of Lazarus taxa. Solid line shows the total number of taxa. Solid bars show percentage origination. Abbreviations of stages: Wor, Wordian; Cap, Capitanian; Wuc, Wuchiapingian; Cha, Changhsingian; Gri, Griesbachian; Die, Dienerian; Smi, Smithian; Spa, Spathian; Ani, Anisian. The Griesbachian and Dienerian comprise the Induan of Figure , the Smithian and Spathian comprise the Olenekian. Data from Erwin .

Figure 3.

Familial diversity of the phylum Porifera through the Permian–Triassic interval. Key as in Figure . Abbreviations as in Figure with the addition of Ind, Induan; Ole, Olenekian; Lad, Ladinian; Car, Carnian; Nor, Norian; Rha, Rhaetian. Data from Benton and the Paleobiology Database (www.pbdb.org; accessed July 2012).

Figure 4.

Familial diversity of the Class Chondrichthyes through the Permian–Triassic interval. Key as in Figure and abbreviations as in Figure . Data from Benton and the Paleobiology Database (www.pbdb.org; accessed July 2012).

Figure 5.

Diversity of families of marine reptiles in the Permian–Triassic interval. Key as in Figure and abbreviations as in Figure . Data from Benton and the Paleobiology Database (www.pbdb.org; accessed July 2012).

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Further Reading

Chen Z‐Q, Kaiho K, George A (2005) Early Triassic recovery of brachiopod faunas from the end‐Permian mass extinction: a global review. Palaeogeography, Palaeoclimatology, Palaeoecology 224: 270–290.

Erwin DH (2006) Extinction: How Life on Earth Nearly Ended 250 Million Years Ago. Princeton and Oxford: Princeton University Press.

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How to Cite close
Twitchett, Richard J, and Foster, William J(Nov 2012) Post‐Permian Radiation. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0001643.pub3]