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Autopsy of a biological extinction example: the Frasnian-Famennian boundary crisis (364 Ma)
Lethiers, F.; Casier, J.G. (1999). Autopsy of a biological extinction example: the Frasnian-Famennian boundary crisis (364 Ma). C. r. Acad. sci., Sér. 2, Sci. terre planètes 329(5): 303-315.
In: Comptes Rendus de l'Académie des Sciences. Série IIA. Sciences de la Terre et des Planètes = Earth and Planetary Science. Gauthiers-Villars: Paris. ISSN 1251-8050, more
Peer reviewed article  

Available in  Authors 

    Famennian; Frasnian; Ostracoda [WoRMS]; Marine
Author keywords
    Frasnian-Famennian; mass extinction; ostracods; species evolution;Lazarus effect

Authors  Top 
  • Lethiers, F.
  • Casier, J.G.

    Without studying the causes of the F/F boundary mass extinction, the precise analysis of ostracod species shows evolutionary process only discernable it the global scale. About 75 % of ail species disappeared in the Uppermost Frasnian in all studied regions of the world. Others survived, with some geographic changes, owing to littoral refuges (Lazarus effect). Deep benthic ostracods seem almost untouched by this event. We show that new post-event species resulted front allopatric speciations by migration between neritic provinces or along continental slopes towards deeper environments. During the event, surviving lineages show a continuous gradation from unscathed species to chronocline species, to phyletic subspeciations or speciations (=pseudo-extinctions) and even to new genera. The durability of lineages is controlled by the migration of populations. (C) 1999 Academie des sciences.

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