This study presents calcareous nannofossils biostratigraphy of the Campanian‒Danian interval at the Gurpi Formation in the southwest of Ilam Province, in the Zagros Basin. The studied sequence of the Gurpi Formation mainly consists of marly shale and limestones. The thickness of Gurpi Formation was measured as approximately 230 m. Forty-five species belonging to twenty-eight genera were recorde...

Upper Triassic deposits formed at the onset of subsidence in Sichuan foreland basin South China, and may record a crisis carbonate deposition related to Carnian Pluvial Episode. However, there is no consensus yet on precise age these northwestern Sichuan. In this work, ammonoid biostratigraphy has been improved, U/Pb from detrital zircons obtained New taxa Sinotropites sichuanensis n. gen., sp....

A mid-Permian (Guadalupian epoch) extinction event at approximately 260 Ma has been mooted for two decades. This is based primarily on invertebrate biostratigraphy of Guadalupian-Lopingian marine carbonate platforms in southern China, which are temporally constrained by correlation to the associated Emeishan Large Igneous Province (LIP). Despite attempts to identify a similar biodiversity crisi...

Abstract. The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages planktonic foraminifera. We examined biostratigraphy, stratigraphic range and preservation upper Eocene Assemblages are well-preserved diverse, with 40 species 11 genera. All samples assigned to Priabonian Globigerinatheka semiinvoluta Highest Occurrence Zone (E14), consistent calcareo...

Four volcanic-ash beds bracket the Early-Middle Triassic boundary, as defined by conodont biostratigraphy, in a stratigraphic section in south China. High-precision U-Pb dates of single zircons allow us to place the Early to Middle Triassic (Olenekian-Anisian) boundary at 247.2 Ma. Magnetic-reversal stratigraphy allows global correlation. The new dates constrain the Early Triassic interval char...