Lithological, magnetostratigraphic and paleontological (nannoplankton, foraminifers,
molluscs) studies were carried out on the Badenian successions of boreholes Sopron-89,
Nagylozs-1 and Sata-75 in Hungary. The correlations with the ATNTS2004 scale show
that the Badenian sedimentation began during Chron C5Br thus the earliest Badenian
deposits are missing in the sections. The first occurrence of Orbulina suturalis Bronnimann
has been observed in Subchron C5Bn.1r, at 14.9 Ma. Although it is older than the interpolated
age of 14.74 Ma in Chron C5ADr in the ATNTS2004, it is consistent with the age of
15.1 Ma obtained from recent calibration of planktonic foraminiferal bioevents. The
base of the Bulimina-Bolivina Zone has been determined at 13.7 Ma in Chron C5ABr,
and the Badenian/Sarmatian boundary is recorded within Chron C5AAn, at 13.15 Ma.
