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A new section of Kaili Formation (cambrian) and a biostratigraphic study of the boundary interval across the undefined cambrian series 2 and series 3 at Jianshan,Jianhe County,China with a discussion of global correlation based on the first appearance dat

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Progress in Natural Science:Materials International 2008年第12期18卷 1549-1556页

作者： Loren E.Babcock School of Earth Sciences Ohio State UniversityColumbusOH 43210USA

A trilobite biostratigraphic study of a new section of the Kaili Formation at Jianshan,Chuandong Village,Jianhe County, Guizhou is *** occurrences of key species associated with the Ovatoryctocara granulata-Bathynotus holopygus Zone and the overlying Oryctocephalus indicus Zone that were originally defined from the trilobite assemblages at the Wuliu- Zengjiayan section of the Kaili are reported from this new *** first appearance datum (FAD) of Oryctocephalus indicus occurs at the 44.52 m above the base of the *** on study of abundant specimens (n=800) from the Kaili Formation, we argue that Oryctocephalus indicus is a widespread taxon with a global *** (Lermontova,1940) from the middle part of the Kounamkites Zone of the Amganian Stage in the Molodo River region of Siberia and *** (Sundberg and McCollum,2003) from Nevada,North America are similar to representatives of *** which occur in the *** Zone of the Kaili *** and *** are here synonymized with *** (Reed,1910).This study strengthens the Wuliu-Zengjiayan section of the Kaili Formation as a candidate section for a Global Stratotype for the base of the unnamed cambrian series 3.

关键词： Jianshan section Kaili Formation Boundary cambrian series 3 Guizhou China

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Distribution of Chancelloriids in a Middle cambrian Carbonate Platform Deposit, Taebaek Group, Korea

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 783-795页

作者： HONG Jongsun CHOH Suk-Joo LEE Dong-Jin Department of Earth and Environmental Sciences Korea University Department of Earth and Environmental Sciences Andong National University

The onset of the cambrian witnessed the diversification of ＂small shelly fossils （SSF）＂, which affected carbonate depositional system. One of the problematic SSF, chancelloriids, are common components of the early to middle cambrian carbonate and shale, and their contributions toward cambrian carbonates are not yet fully understood. This study assesses distribution patterns of chancelloriid sclerites in the cambrian series 3 Daegi Formation based on microfacies analysis and discusses their sedimentologic implications. In the lower part of the formation, partially articulated chancelloriid sclerites occur mainly in bioclastic packstone and grainstone facies, with isolated sclerite rays in nodular packstone to grainstone facies. In the middle part of the formation, chancelloriid fragments occur only sporadically in bioclastic wackestone to packstone, bioclastic grainstone and oolitic packstone to grainstone facies, whereas boundstone facies are nearly devoid of their fragments. There are no chancelloriid fragments in the upper part of the formation, which consists of oolitic packstone to grainstone facies. Chancelloriids are interpreted to have primarily occupied platform margin shoal environments, shedding their sclerites to surrounding areas, and thus contributed as sediment producers. The distribution of Daegi chancelloriid sclerites is similar to other cambrian examples, with the exception of common chancelloriids in cambrian series 2 reefs and their apparent near absence in the Daegi and other cambrian series 3 reefs. This disparity resulted from changes in the ecologic niche of chancelloriids after the end-cambrian series 2 reef crisis, coupled with an overall decline of chancelloriids in the middle cambrian.

关键词： cambrian series 3 chancelloriid shoal carbonate platform reef

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