| 概要 |
Based on the available informations, the stratigraphic occurrences of the Palaeofusulina-Reichelina-Codonofusiella fauna in the Tethyan realm are reviewed and summarized. The Upper Permian Dzhulfian f...usulininan zone is, as established by SHENG (1963), divisible into the upper Palaeofusulina-Reichelina zone and the lower Codonofusiella-Reichelina zone. The genus Palaeofusulina is restricted in stratigraphic occurrence exclusively to the Dzhulfian, but the genera Codonofusiella and Reichelina range from the Dzhulfian downward to the Guadalupian Yabeina and Neoschwagerina zones and even to the Artinskian Parafusulina zone. The Lepidolina multiseptata shiraiwensis zone of the Kuman biofacies is nearly equivalent in age to the Y abeina globosa zone of the Kinshozan biofacies, and these two zones are considered to be lower than the Lepidolina kumaensis zone. The Lepidolina kumaensis fauna occurs often along with the Codonofusiella-Reichelina fauna, being the lower Dzhulfian in age, with a possibility of ranging upward to a part of the upper Dzhulfian. The complete extinction of the Palaeofusulina fauna does not coincide with the close of the Permian Period, though there is still a possibility that few species of longranging genera, such as Nankinella and Sta/fella, persisted longer close to the boundary between the Permian and the Triassic.続きを見る
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