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. The Permian–Triassic boundary section in the Aras Valley in NWIran is investigated with respect to carbonate microfacies, biostratigraphy(particularly conodonts, nautiloids, and ammonoids), chemostratigraphy(carbon isotopes), and environmental setting. Correlation of the data allowsthe establishment of a high-resolution stratigraphy based on conodonts (withfour Wuchiapingian, 10 Changhsingian, and three Griesbachian zones),ammonoids (with nine Changhsingian zones), and carbon isotopes; it formsthe base for the reconstruction of the environmental changes before andafter the end-Permian extinction event at the studied locality. In the ArasValley section, there is no evidence for the development of anoxicconditions, associated with the end-Permian mass extinction.

Aras Valley (northwest Iran): high-resolution stratigraphy of a continuous central Tethyan Permian–Triassic boundary section