Genesis of Permian copper deposits in Poland |
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| Abstract: | Varying correlations of Triassic continental deposits are the chief cause of the differences in biogeographic zonation of the Triassic continents. In order to correlate the continental deposits of Triassic age on the basis of their plant fossils, one must appraise the stratlgraphic significance of the most important foral assemblages in Triassic deposits. Within the Triassic system there are plant fossil assemblages associated with marine deposits, which can be dated directly. Age of the plant assemblages In the German basin can be determined by correlation with the Alpine section. The age of the homotaxic plant fossil assemblages of Europe and Asia can be established on the basis of a comparison with the above-mentioned standard assemblages. Four phytostratigraphic horizons (the Indian, Olenekian-Anisian, Ladinian-Carnian, and Norian-Rhaetian) can be distinguished in Eurasia. Biogeographic zonation is considered separately for the time interval represented by each of these horizons. Correlation of the fossil floral assemblages of North America and Gondwana with those of Eurasia is based on different paleontological data (tetrapod fossils playing the leading part in North America). Maps of the biogeographic zonation of the continental Triassic were prepared for the Oleneklan-Anisian and the Ladinian- Carnian intervals of time; for the southern hemisphere these are based on the mobilist concept. —Author. |
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