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1 School of Ocean and Earth Science, Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, UK dys{at}mail.soc.soton.ac.uk
2 Institute of Geology and Exploitation of Combustible Fuel, Fersman 50, Moscow 117312, Russian Federation
3 Museum für Naturkunde der Humboldt-Universität, Paläontologisches Institute, Invalidenstrasse 43, 10115 Berlin, Germany
4 Department of Geoscience, University of Iowa, Iowa City, IA 52242, USA
5 All-Russia Research Geological Oil Prospecting Institute, Shosse Entuziastov 36, Moscow 105819, Russian Federation
The development of the Frasnian (Upper Devonian) reef complexes of the southern Timan and Pechora region of northern European Russia is described. Barrier reef complexes progressively prograded eastwards during the Frasnian but the carbonate complexes were interrupted many times by regressive events. Using new conodont and ammonoid biostratigraphical dating, the timing of reef building episodes has been established which enables international correlation with other similar Devonian areas. Basinal anoxic and hypoxic deposits associated with the reef complexes of the Domanik facies provide the major hydrocarbon source rocks of the region and the palaeoenvironmental interpretation of these is discussed. Initial transgressions appear to have been associated with the global Taghanic Onlap of the late Givetian. The new level for the base of the Frasnian and Upper Devonian lies in the Timan Formation, after the deposition of which marine conditions mostly prevailed in the area examined until the late Frasnian when a sharp regression occurred with no evidence of the typical Kellwasser facies of Western Europe and other areas. Transgressive pulses initiated ammonoid biofacies in the Regional Sargaev Stage and the widespread Timan Event was marked by the spread of Timanites faunas. A significant deepening event which initiated the Domanik facies correlates approximately with the Middlesex black shale of New York and the main development of the Domanik facies with the Rhinestreet black shale of New York. There are faunal and floral peculiarities of the area, shown by endemic genera and rather different ranges of cosmopolitan species than elsewhere, which complicates precise international correlation. Nevertheless, several of the main sea-level deepening pulses of the Frasnian, documented in North America, Western Europe, North Africa and Australia, are recognizable and these are thought to represent eustatic events.
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  R. T. Becker and W. T. Kirchgasser Devonian events and correlations--a tribute to the lifetime achievements of Michael Robert House (1930-2002) Geological Society, London, Special Publications, 2007; 278: 1 - 8. [Full Text] [PDF]
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