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Geological Society, London, Special Publications; 1996; v. 102; p. 187-199;
DOI: 10.1144/GSL.SP.1996.001.01.13
© 1996 Geological Society of London

Palaeozoic

The mid-Carboniferous rugose coral recovery

O. L. Kossovaya

All-Russian Geological Research Institute (VSEGEI), Srednyi prospect 74, St Petersburg 199026, Russia

The taxonomic diversity of the rugose corals following the mid-Carboniferous ‘lesser mass extinction event’ (Alekseev 1989) may be subdivided into two intervals. The survival interval includes long-ranging survivors, short-ranging survivors (Dibunophyllum, Palaeosmilia, Diphyphyllum), survivors with post-crisis ontogenetic changes (Caninia, Bothrophyllum), newly-appeared taxa with hypothetical ancestors (Profischerina, Protodurhamina) and those of cryptogenic origin (Lytvophyllum). The lower limit of the survival interval coincides with the Eumorphoceras/Homoceras Zone and can be identified in the Donetz Basin, Gornaya Bashkiria, Novaya Zemlja, North Timan, Cantabrian Mountains (Rodriguez et al. 1986) and the Western Interior of the USA (Sando 1989).

The recovery interval is established by the appearance of the immigrant genus Petalaxis and by increasing specific diversity in pre-existing lineages. Its lower limit corresponds to the Pseudostaffella praegorsky—Profusulinella staffelliformis boundary, the lower boundary of the Westphalian A in the Cantabrian Mountains and the lower boundary of the Atokan Series in the Western Interior of the USA.

The radiation interval was marked by the appearance of astreoid colonies in the Petalaxis—Ivanovia lineage at the Fusulinella calaniae—F. vozhgalensis—F. kamensis lower boundary.