At the modern stage, the pace of research of medieval period in history of Western Transbaikalia dropped significantly.The paper presents preliminary results of the excavations of three medieval tombs of two recent discovered burial grounds - Nizhniy Mangirtuy 1 and 2 and Nur-Tukhum 2.The issue of cultural attribution of medieval burials kaiser copy stands and determination of their chronological position is still relevant.
It is proposed to restrict the chronological boudaries of the Early Mongolian archaeological culture and keep the classification for the Khoyzegor and Sayantui stages.The era of the Great Empire citronella horse shampoo of the XIII-XIV centuries rised after the early Mongolian culture, is proposed to be called the Mongolian time.To resolve the issues of the chronological dividing of the Middle Age of Buryatia facing archeology is need the increasing of radiocarbon dating of burial and settlement complexes.