نتایج جستجو برای: upper permian
تعداد نتایج: 207735 فیلتر نتایج به سال:
The Alborz structural zone in northern Iran is the host of a number of bauxite deposits. The Gheshlagh bauxite deposit is one of them with more than 2 km long and a thickness of about 20 m in the eastern part of the Alborz structural zone. This deposit has been developed as a stratiform horizon along the contact zone of Permian limestones and Triassic dolomitic limestones. The basal contact zon...
The monotypic genus Alekhosara Aristov, 2008 from the locality Novo-Alexandrovka (Russia, Orenburg Region; Upper Permian, Severodvinian Stage) is briefly redescribed and transferred family Liomopteridae (order Reculida) to Locustavidae Orthoptera). Thus, this possibly a most ancient representative of orthopteran suborder Caelifera, previously known since Early Mesozoic only.
The Permian-Triassic Mass Extinction (PTME) is the greatest biotic crisis of Phanerozoic. In terrestrial settings, PTME appears to have been diachronous and it has suggested that losses initiated before marine crisis. We examine organic carbon-isotope (?13Corg) geochemical proxies for environmental change in a palaeotropical wetland succession from southwest China. A newly constructed astronomi...
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