The age of the Ruscinian lower boundary [Stáří spodní hranice Ruscinia]
Michail Pevzner, Eleonora Vangengejm, Aleksej Tesakov
Ruscinian locality Novaja Stanica (West Siberia) with the fauna of primitive Promimomys and Baranomys is placed at the boundary of Chron 5 and Gilbert Chron. Late Turolian Kalmakpai locality (Kazakhstan) is placed at the lower part of Chron 5. The position of these sites in the magnetochronological scale makes it possible to access the age of the Ruscinain lower boundary at about 6 Ma (the end of Chron 5).