Major stages in the studies of the Permian marine basins of Mongolia and new data on their biostratigraphy and fauna

Abstract

Invertebrate faunal assemblages from sedimentary beds of marine basins of Mongolia are studied. The paper includes descriptions, lists of fossils, and coordinates of the reference and auxiliary sections. Eight horizons, 11 brachiopod, and four foraminiferal zones are substantiated. The lists of fossils for all brachiopod and foraminiferal zones of the Khangai-Khentei (Boreal) and South Mongolian (Tethys) basins are given. The evolution of Mongolian basins is analyzed; possible biogeographic connections, pathways and trends in migrations of brachiopods are considered. The correlation of the recognized horizons and zones with equivalents in the adjacent regions in northeastern Asia is substantiated.