the permian deposits in the stratigraphic section of sangsar (located in the eastern alborz), are the best expose in the semnan area. this sequence consists of the doroud (asselian-sakmarian), ruteh (artinskian-murgabian) and nessen (early djulfian) formations. the dorud formation in the studied section with 56 m thickness consists of conglomerate, sandstone and quartzite, which is disconformit...

Carbon cycle disturbance associated with mass extinction at the end of the Permian Period continued through the Early Triassic, an interval of approximately 5 million years. Coincidence of carbon cycle stabilization with accelerated Middle Triassic biotic recovery suggests a link between carbon cycling and biodiversity, but the cause of Early Triassic carbon isotope excursions remains poorly un...

The first findings of Antracoptilidae (Paoliida) from the Late Permian/ Early Triassic of Africa, i.e. the new genus Afrocladus comprising A. pumilio sp. nov. and A. kenyaensis sp. nov., are described from the Mombasa Basin of Maji ya Chumvi Formation in Kenya (Duruma sandstones). Both diagnoses are based on wing venation pattern. Their occurrences close to the P-T boundary possibly indicate th...

Global warming is widely regarded to have played a contributing role in numerous past biotic crises. Here, we show that the end-Permian mass extinction coincided with a rapid temperature rise to exceptionally high values in the Early Triassic that were inimical to life in equatorial latitudes and suppressed ecosystem recovery. This was manifested in the loss of calcareous algae, the near-absenc...

Based on seven measured sections from Svalbard, the marine strata of the Permian Kapp Starostin Formation are arranged into seven transgressive–regressive sequences (TR1–TR7) of c. 4– 5 Ma average duration, each bound by a maximum regressive surface. Facies, including heterozoandominated limestones, spiculitic cherts, sandstones, siltstones and shales, record deposition within inner, middle and...

Ancient mass extinction events such as the end-Permian and endTriassic crises provide analogues for multistressor global change of ocean warming, pH reduction, and deoxygenation. Organism physiology is hypothesized to be a key trait influencing vulnerability to these stressors, but it is not certain how physiology predicts survival over evolutionary time scales and when organisms are faced with...

New U–Pb detrital zircon and ages of metaigneous rocks in the Águilas Arc (Betic Chain, SE Spain) allow us to determine maximum depositional rocks. Within Nevado-Filábride Complex, a Late Carboniferous age for Lomo de Bas schists quartzites, Permian-Triassic Tahal Fm are determined. Alpujárride Micaschists Quartzite is Meta-detrital was deposited Early Permian. Furthermore, Saladilla Maláguide ...