Abstract

This chapter presents new results for the biostratigraphy of Miocene land mammals of Central Mongolia (Valley of Lakes). The Valley of Lakes is well known for its basalt layers interfingered with Paleogene and Neogene sediments. It is among the best places in Mongolia where fossiliferous terrestrial sediments are associated with basalts. The Taatsiin Gol and Taatsiin Tsagaan Nur area comprises a sequence of terrestrial sediments that can be divided into the Gol and Loh formations. All Miocene small mammal fossils (biozones D to E) derive from sediments of the Loh Formation. The chapter begins with a description of the integrated Oligocene/Miocene stratigraphy from the Taatsiin Gol and Taatsiin Tsagaan Nuur area. It then analyzes Miocene deposits in the area, along with emended biostratigraphy and biochronology of informal biozones D to E.

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