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- W1570704407 abstract "An ample report presenting the current progress in recognition of the Global stratotype section and Point (GssP) for the base of the kimmeridgian stage has been presented in the last issue of isJs Newsletter (Wierzbowski, 2008). It should be remembered that the Flodigarry section at Staffin Bay in Skye, northern Scotland, has been accepted both by the kimmeridgian Working Group, and the international subcommission on Jurassic stratigraphy as the primary standard for the kimmeridgian stage with its base located at the base of the subboreal baylei ammonite zone. The only problem (and the most complicated one) which is still unresolved is which of the two ammonite horizons based on successive members of the genus Pictonia marks the base of the baylei zone: the flodigarriensis horizon or, lying directly above, the densicostata horizon (Fig. 1; see also Matyja et al., 2006; Wierzbowski et al., 2006 where the horizons and the section in question are described in detail). New biostratigraphical data from other sections (cores from barents sea and Norwegian sea, the Nordvik section of northern siberia, the Unzha river section of the kostroma District of russian Platform) revealed a larger correlation potential for the base of the flodigarriensis horizon than the base of the densicostata horizon, and thus its larger significance in recognition of the base of the Kimmeridgian Stage in the Subboreal and Boreal areas of Arctic, as well as northern europe and northern Asia (Wierzbowski, smelror, 1993; Wierzbowski et al., 2002; rogov, Wierzbowski, 2009; Glowniak et al., 2010). This preference results from good correlation between the base of the flodigarriensis horizon treated as the base of the subboreal baylei zone, and the base of the boreal bauhini zone – marked by appearance of ammonites of Amoeboceras (Plasmatites) group such as A. (P.) praebauhini (salfeld) and A. (P.) lineatum (Quenstedt) (see Wierzbowski, 2008) which show a wide palaeogeographical distribution and are very useful in stratigraphical correlations. The recent study of the subboreal aulacostephanids from southern england – i.e. their “home area” (Wright, 2010) – evidences the incompleteness of the succession at the boundary of the oxfordian and kimmeridgian in these sections, but indicates the presence of the flodigarriensis horizon in some basinal sections of the area, such as the Wessex basin. Thus, the previously supposed local occurrence of an index ammonite – the Pictonia flodigarriensis of the flodigarriensis horizon in northern scotland only – used as argument against wider recognition of the base of the flodigarriensis horizon as a uniform boundary of the oxfordian/ kimmeridgian boundary, is not substantiated. The problem still not resolved is the correlation potential of the flodigarriensis horizon versus that of the densicostata horizon in recognition of the uniform oxfordian/kimmeridgian boundary in the submediterranean/Mediterranean and other (e.g. Pacific) successions of the World. Nevertheless, general opinions related to wider recognition of the oxfordian/kimmeridgian boundary outside the subboreal/boreal successions can be given. The results of studies of subboreal and boreal ammonites occurring in the submediterranean succession in europe (especially in Poland and" @default.
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- W1570704407 date "2010-01-01" @default.
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- W1570704407 title "On the Oxfordian/Kimmeridgian boundary and its GSSP – current state of knowledge" @default.
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