Abstract
The regional zonation of the Wenlock-Ludlow boundary is established for the Prague Synform using refined data from updated conodont records. The following conodont zones have been recognized in the Prague Synform: the Ozarkodina sagitta sagitta Zone, the Ozarkodina bohemica Interval Zone, the Kockelella crassa Zone, the Kockelella variabilis variabilis Interval Zone and the Ancoradella ploeckensis Zone. The Ozarkodina bohemica longa and Kockelella ortus absidata zones are used herein at subzonal level only because the entries of index taxa cannot be precisely detected. The Bohemian conodont zonal scale is correlated with the recently proposed standardized zonation. The established conodont zones are tentatively correlated with global graptolite zonation and matched against generalized eustatic and carbon isotope curves.
Highlights
The definitions of the series and stages of the Silurian System and their correlation are traditionally based on relatively well developed graptolite zonation
The regional zonation of the Wenlock–Ludlow boundary is established for the Prague Synform using refined data from updated conodont records
The following conodont zones have been recognized in the Prague Synform: the Ozarkodina sagitta sagitta Zone, the Ozarkodina bohemica Interval Zone, the Kockelella crassa Zone, the Kockelella variabilis variabilis Interval Zone and the Ancoradella ploeckensis Zone
Summary
The definitions of the series and stages of the Silurian System and their correlation are traditionally based on relatively well developed graptolite zonation. A more complete zonation of the Wenlock–Ludlow boundary interval was established in Sardinia (Corradini & Serpagli 1999; Corriga et al 2009) (see Fig. 1) It comprises conodont zones based on the most relevant taxa described by Walliser: the Oz. s. Ozarkodina bohemica longa and Kockelella ortus absidata, were, incorporated to the generalized global conodont zonal scale by Cramer et al (2011) Their zonation for the Homerian and Gorstian was adopted by Melchin et al (2012) into the recent Silurian Time Scale. This zonal scale seems to be of general use. Synchroneity of conodont indexes involved is often uncertain
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