Revision of ammonoid biostratigraphy in the Frasnian (Upper Devonian) of the Southern Timan (Northeast Russian Platform)

Authors

  • R. Thomas Becker Museum für Naturkunde der Humboldt-Universität zu Berlin, Invalidenstr. 43, D-10115 Berlin
  • Michael R. House School of Ocean and Earth Science, Southampton Oceanography Centre, European Way, Southampton, SO 14 3ZH
  • Vladimir V. Menner Institute of Geology and Exploitation of Combustible Fuel, Fersman 50, Moscow 117312
  • N. S. Ovnatanova All-Russia Research Geological Oil Prospecting Institute, Shosse Entuziastov 36, Moscow 105819

Keywords:

Timan, Russia, Devonian, Frasnian, Ammonoids, Goniatites, Biostratigraphy

Abstract

New field work in outcrops of the Ukhta Region (Southern Timan) together with the re-exanimation of former collections allows a detailed revision of the ammonoid zonation in one of the classical Frasnian regions of Russia. There is a total of 47 species, 18 of which are new or recorded for the first time from the region. The latter applies to representatives of Linguatornoceras, Phoenixites, Aulatornoceras s.str. and Acanthoclymenia. New taxa are Chutoceras manticoides n.gen. n.sp. and Linguatornoceras yudinae n.sp. In the Ust’yarega Formation regional Hoeninghausia nalivkini, Timanites keyserlingi and Komioceras stuckenbergi Zones can be recognized which correlate with the international Frasnian divisions UD I-B/C. The Ponticeras domanicense Zone (UD I-E) occupies most of the Lower Domanik, the Nordiceras timanicum Zone (UD I-F to I-H) is developed in the Middle and Upper Domanik. Following a poorly defined and short interval with rare Carinoceras, pelagic sequences of the Lyaiol Formation (Members 2-4) fall in the Virginoceras jaschenkoae and Manticoceras lyaiolense Zones (UD I-I/J). Late Frasnian deposits (UD I-K/L) have not yielded any ammonoids so far. Correlation between the new zonation and the conodont zonation (Montagne Noire zones) is provided.

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