Reference
Reinhard Roetzel, Arjan de Leeuw, Oleg Mandic, E. Marton, Slavomir Nehyba, Klaudia F. Kuiper, Robert Scholger, Ingeborg Wimmer-Frey (2014): Lower Miocene (upper Burdigalian, Karpatian) volcanic ashfall
at the south-eastern margin of the Bohemian Massif in
Austria New evidence from Ar/ Ar-dating, palaeomagnetic,
geochemical and mineralogical investigations – Austrian Journal of Earth Sciences – 107_2: 2 - 22.