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Fig. 1.

Correlation chart for the Cambrian biostratigraphic units of important regions/palaeocontinents with presently acknowledged regional series and stages as well as biostratigraphical units (slightly modified by the author in some cases). Colours indicate defined or suggested stages. Positions of correlation based on the FAD of accepted levels (discussed in the text) flagged at the right-hand margin; abbreviations: Wc, Watsonella crosbyi; FT, first occurrence of trilobites; HCST, Hebediscus attleborensis–Calodiscus lobatus–Serrodiscus–Triangulaspis band; Og, Ovatoryctocara granulata; Oi, Oryctocephalus indicus; Pg, Ptychagnostus gibbus; Pa, Ptychagnostus atavus; Pp, Ptychagnostus punctuosus; Ll, Lejopyge laevigata; Gs, Glyptagnostus stolidotus; Gr, Glyptagnostus reticulatus; IA, Irvingella in association with Agnostotes; En, Eoconodontus notchpeakensis; Cp, Cordylodus proavus. Significant positive carbon isotope peaks indicates by ochre stars, negative peaks by green stars. Radiometric age determinations from numerous authors (e.g., Bowring et al., 1993 (d); Landing et al., 1998 (a), 2015 (c), submitted (f); Zhu et al., 2009 (k); Wei et al., 2018 (m); Compston et al., 2008 (g); Harvey et al., 2011 (b); partly recalculated by Schmitz, 2012 (e); Nagovotsin et al., 2015 (h); Rogov et al., 2015 (i); Perkins and Walshe, 1993 (n); Karlstrom et al., under review (o); Isachsen et al., 1994 (p). Remarks on the columns: A number of stage names are used to date in a wrongly derived spelling. These orthographic mistakes are corrected (e.g., Botoman/Botomian; Delamarian/Delamaran; Dyerian/Dyeran; Marjumian/Marjuman; Topazian/Topazan). Baltica: The column for Baltica is dominated by the zones used in Sweden/Scandinavia, with an updated zonation for the Furongian as suggested by Terfelt et al. (2008). The early Cambrian stages are modified from Nielsen and Schovsbo (2011) using biostratigraphic results from Cederström et al. (accepted). Sibiria: “Sibiria is used as a name for the Palaeozoic continent, differing from “Siberia as the name for the modern-day geographic region. The chronostratigraphic units used in the column for the Siberian Platform is recombined from the established units (e.g., Lazarenko et al., 2011) and the revision suggested by Varlamov et al. (2013), which is not yet officially ratified. “Altay-Sayan” refers to the foldbelt region. The names for the subdivisions refer to the traditional “horizons” (горизон) which are not stages or any kind of chronostratigraphic units. The used units are from Korzhnev (2012) and Naimark and Pegel’ (2017). The transcription of the names is revised. North China: Abandoned traditional series and stages which were originally transferred from South China are shown in grey for better orientation. South China: Decisions on GSSPs prompted renaming and (partly) redefinitions on regional series and stages (Peng, 2009; National Commission Stratigraphy of China, 2014; Peng, 2018; Peng and Zhao, 2018), with revision of the established scheme. Due to better orientation and creation of homonyms the earlier scheme in shown in grey. Different biozones for the Fortunian through Drumian refer to differences between the platform and slope facies. The Parabadiella huoi Zone is spelled Abadiella huoi Zone in the modern schemes based on the erroneous assumption that Parabadiella is a junior synonym of Abadiella (see discussion in Geyer, in press). Laurentia: The column shows the traditional position of the lower boundary of the Ibexian Series and Skullrockian Stage. See also Babcock et al. (2011) for suggested internationalization of the Laurentian stratigraphy. Base of the Marjumian Stage indicated in the original definition (see Sundberg 2005), not as revised by Palmer (1998). Different biostratigraphic zonation used for the lower–middle Cambrian boundary interval reflect regional units.

Episodes 2019;42:321~332
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