Taxonomic diversity of foraminifers of the Devonian-Carboniferous boundary interval in the South Urals

Abstract

The taxonomic diversity of foraminifers from the Devonian-Carboniferous boundary beds was studied in the key sections on the western slope of the South Urals in Russia and from Mugodzhary in Kazakhstan. These sections are mainly composed of marine carbonates, apparently deposited in a shallow-water environment. The boundary interval contains 111 species belonging to 30 genera within the foraminiferal zones <i>Quasiendothyra communis, Q. kobeitusana, Tournayellina beata pseudobeata, Earlandia minima, </i>and <i>Chernyshinella disputabilis </i>of the Russian General Stratigraphic Scale. Maximum diversification is recorded in the <i>Q. kobeitusana </i>Zone, and minimum species diversity is observed in the <i>Earlandia minima </i>Zone

A new early Frasnian (Late Devonian) foraminifer from eastern Taurides (Turkey): Evolutionary and paleobiogeographic implications

“…Early Frasnian of eastern Taurides (Turkey; this study); late Frasnian-Famennian of the central and northern Urals (Russia) (Reitlinger, 1962;Chuvashov, 1965;Shuysky, 1980); and perhaps Givetian of Moravia (Zukalová, 1981a), Frasnian of Moravia (Zukalová, 1981b), Frasnian of South-Devon (England) (Kircher and Brasier, 1989), and latest Famennian (Lytvian) of the southern Urals, Russia (Kulagina, 2013).…”

“…• according to Kulagina (2013), Tournayellina beata pseudobeata Reitlinger and Kulagina, 1987 appears in the topmost Famennian (4.5 m below the Devonian-Carboniferous boundary); • this FAD is located in the middle praesulcata Zone of conodonts according Kalvoda and Kukal (1987) (Bykova, 1952). Sample HBF13-Mi14.…”

“…Tournayellinidae are a group, which does not look anything special, but it is one of the important for characterizing the Devonian-Carboniferous boundary (Conil and Lys, 1970;Conil et al, 1986;Kalvoda and Kukal, 1987;Kalvoda, 1990;Kulagina, 2013), because:…”

Editorial preface: IGCP 596, Mid-Paleozoic climate and biodiversity: Proceedings of the Opening Meeting in Graz, Austria (September 19–24, 2011)

“…The taxonomic study on foraminifers of the Devonian-Carboniferous boundary interval in the South Urals by Kulagina (2013) shows that biodiversity especially of endothyrids reached a peak during the Late Devonian which was followed by a drop in evolutionary rates and extinction related to the Hangenberg Event. Lowest diversity dominated by unilocular growth forms is observed in the early Tournaisian.…”

Early Carboniferous trilobite remains from limestones of the Dębnik Anticline, southern Poland

“…Based on the age-diagnostic forms such as Earlandia elegans (Rauser-Chernousova & Reitlinger) and Eochernyshinella crassitheca (Lipina), these limestones are correlated with the Chernyshinella disputabilis Foraminiferal Zone of the South Ural (Kulagina 2013), which corresponds to the Siphonodella belkai Conodont Zone in the same region. The Szklary Formation in the Dębnik Anticline has been earlier correlated by Poty et al (2007) with the MFZ2 Foraminiferal Zone of the Belgium Dinant's sedimentation area.…”