In recent years, conchostracan biostratigraphy has become a popular tool for the recognition of the Permian Triassic boundary and for the chronostratigraphic subdivision of the Triassic in intracontinental settings, including also the bone-hearing Keuper strata of Poland. The ambiguous nature of the new bio-chronostratigraphic approach was characterized in a case study of the Permian Triassic boundary interval. The most important problems were: (I) the lack of documentation of the index species, (2) the indirect correlation with the conodont stratigraphy in marine reference sections through the sporomorph spectra, (3) the lack of definition and documentation of supporting palynologic zones, and (4) difficulties in reliable taxonomic determination of Conchostraca. Testing and, if necessary, revision of the zonation by several independent research groups is suggested.
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Deakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Zhang, Yang
Zhang, Ke-Xin
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Zhang, Ke-Xin
Shi, G. R.
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Deakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, AustraliaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Shi, G. R.
He, Wei-Hong
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
He, Wei-Hong
Yuan, Dong-Xun
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Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Yuan, Dong-Xun
Yue, Ming-Liang
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China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Yue, Ming-Liang
Yang, Ting-Lu
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China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R ChinaDeakin Univ, Sch Life & Environm Sci, Burwood, Vic 3125, Australia