ARTYKUŁY NAUKOWE Muszloraczkowa stratygrafia pogranicza permu i triasu – rzeczywistość czy mit?
Abstract
Conchostracan stratigraphy of the Permian/Triassic boundary interval – reality or myth?
A b s t r a c t. In the last years, the conchostracan stratigraphy has become a popular method for distingushing the Permian/Triassic boundary in intracontinental settings. This paper provides a background of chronostratigraphic interpretation of the new method. Several problems are reported, from which the most important are: 1 – lack of consequent documentation of the index species, 2 – indirect correlation with the conodont stratigraphy through the sporomorph spectra, 3 – lack of definition and documentation of supporting palynologic zones, 4 – difficulties in taxonomic determinations of conchostracan. Revision of the method by several independent research teams is suggested.
A b s t r a c t. In the last years, the conchostracan stratigraphy has become a popular method for distingushing the Permian/Triassic boundary in intracontinental settings. This paper provides a background of chronostratigraphic interpretation of the new method. Several problems are reported, from which the most important are: 1 – lack of consequent documentation of the index species, 2 – indirect correlation with the conodont stratigraphy through the sporomorph spectra, 3 – lack of definition and documentation of supporting palynologic zones, 4 – difficulties in taxonomic determinations of conchostracan. Revision of the method by several independent research teams is suggested.