Frasnian-Famennian (Upper Devonian) transition in the northern hemisphere (NE Laurussia and NE Siberia) - an overview


Authors: Zhuravlev AV, Sokiran EV

Published in: Bulletin of Geosciences, volume 95, issue 4; pages: 419 - 439; Received 18 March 2020; Accepted in revised form 10 July 2020; Online 30 August 2020

Keywords: Frasnian-Famennian boundary, northern hemisphere, conodonts, brachiopods, facies changes, Laurussia, Siberia,

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There is high similarity in sedimentation and taxonomic composition and stratigraphic succession of conodonts and brachiopods across the Frasnian-Famennian (F-F) transition in low- and mid-latitude realms of NE Laurussia and Siberia. This uniformity suggests the presence of low environmental gradients between 10° S and 40° N of the northern hemisphere corresponding to tropical and subtropical climatic zones. The changes in taxonomic diversity in these marine faunas occurred gradually throughout the Frasnian, and were paired with similar, mostly carbonate facies settings, marked by rare development of the Kellwasser-type organic-rich deposits. Moderated ecological effect of the rapid climatic shifts during the F-F crisis is also noteworthy, especially for the shelly benthos, with an exception of the Lilliput effect.