 Delta-13 carb and Delta-13 corg stable data reveal details about the early middle Frasnian boundary interval of the Pimvishore River section in the Cisseurals, including an oxygen-depleted depositional environment and the presence of iso-renerateen derivatives. The Pimvishore River section contains Delta-13 carb and Delta-13 corg isotope records related to the early middle Frasnian isotope event, which shows a robust correlation with Chinese Delta-13 carb and Delta-13 corg oscillations. The magnitude of variations in values of Delta-13 corg and Delta-13 carb in the Punctata zone in the Pimvishore River section are minor than those observed in other successions, possibly reflecting specific local environmental variations. This article was authored by Ivan S. Kotick, Andre V. Zurovlev, Tatiana V. Madel, and others.