The loess–paleosol–cryptotephra sequence at Otkaznoe (Stavropol region, Russia): New insights into Middle to Late Quaternary subaerial stratigraphy in the Southern East European Plain

Evgeny A. Konstantinov; Vera V. Ponomareva; Nikita V. Sychev; Maxim V. Portnyagin; Vasily D. Shcherbakov; Elena A. Mazneva; Daria N. Laskina; Pavel G. Panin; Fatima G. Kurbanova; Varvara I. Dudanova; Roman V. Veselovskiy; Andrey L. Zakharov; Maria N. Lazareva; Marina V. Khmeleva; Redzhep N. Kurbanov