Palaeoecological features of Lower Asselian (Lower Permian) carbonate skeletal mounds in the Pisanyi Kamen’ section (Un’ya River, Northern Urals)

Abstract

Upper Carboniferous-Lower Permian biogenic carbonate buildups are widespread throughout the world (Wahlman, 2002). They are numerous on the western slope of the Urals; the most famous of them being the 'Reef' massif on the Kozhym River (Subpolar Urals) and biogenic structures in the Southern Urals (called 'shikhans'), which have been described in the international literature (Antoshkina, 1997;