Abstract
Abstract. Permian–Triassic boundary sections at Baghuk Mountain (Central Iran) are investigated with respect to their lithological succession, biostratigraphy (particularly conodonts, nautiloids and ammonoids) as well as chemostratigraphy (carbon isotopes). The rock successions consist of the Late Permian Hambast Formation, the youngest Permian Baghuk Member (new name for the “Boundary Clay”) and the Early Triassic Claraia beds. Correlation of the data allows the establishment of a high-resolution stratigraphy based on conodonts with seven Changhsingian zones. Abundant ammonoids enable the separation of ammonoid assemblages with the successive Wuchiapingian genera Prototoceras, Pseudotoceras and Vedioceras, as well as the Changhsingian genera Shevyrevites, Paratirolites, Alibashites, Abichites and Arasella. Griesbachian and Dienerian ammonoids are usually poorly preserved. Nautiloids occur predominantly in the Wuchiapingian part of the section with two successive assemblages dominated by the Liroceratidae and Tainoceratidae, respectively. Numerous Early Triassic strata contain microbialites of various outer morphology and microstructure. The carbon isotope curve (δ13Ccarb) shows a continuous late Changhsingian negative excursion continuing across the Baghuk Member with the lightest values at the base of the Triassic.
Highlights
The search for gapless sections spanning the Permian– Triassic boundary has developed into an important geoscience project in recent years
The rock successions consist of the Late Permian Hambast Formation, the youngest Permian Baghuk Member and the Early Triassic Claraia beds
We present an overview on various aspects of the Baghuk Mountain section
Summary
The search for gapless sections spanning the Permian– Triassic boundary has developed into an important geoscience project in recent years. The discovery of fossil-rich sedimentary successions ranging from the Permian into the Triassic at Baghuk Mountain in Central Iran (Fig. 1) opened up the possibility to study further sections regarding their lithological, geochemical and biological evolution before, during and after the extinction event. D. Korn et al.: Baghuk Mountain (Central Iran) near Abadeh. Korn et al.: Baghuk Mountain (Central Iran) near Abadeh Both regions show very similar lithological successions. Both the number and the preservation of macrofossils at Baghuk Mountain are better than in the Hambast Mountains. The new, so far largely undescribed sections have a high potential for an important contribution to the decoding of the most severe mass extinction in Earth history. Detailed studies of various fossil groups (e.g. ammonoids, nautiloids) and microbial structures will be performed separately
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