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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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Yu, Jianxin
Broutin, Jean
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Univ Paris 06, Sorbonne Univ, Ctr Rech Paleobiodivers & Paleoenvironm Paleobot, Paris, FranceChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Broutin, Jean
Chen, Zhong-Qiang
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Chen, Zhong-Qiang
Shi, Xiao
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Shi, Xiao
Li, Hui
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Li, Hui
Chu, Daoliang
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China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
Chu, Daoliang
Huang, Qisheng
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China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R ChinaChina Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China