Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 2. 1970-71. (Budapest, 1971)

It the end of the Early Oligocène, the Tard facies becomes uniformly developed everywhere. Eig. 2.

î Late Upper Eocene paleogeography of

ithe Bükk Mountains foreland. - 1 = Eocene unknown. 2 = 30-80 m sea depth. 3 = 80-120 m sea depth. 4 = 120-220 m sea depth. 2. ábra: A bükkalji terület ősföldrajzi képe a felső eocén végén. - 1 = Eocén képződmény nem ismert. 2 = 30-80 m mély tenger. 3 - 80-120 m mély tenger. 4 = 120-220 m mély tenger. Lithological changes' can be summed up as follows: calcareous, biogenic sediments in the Eocene, were followed during the Early Oligocène by clays with low carbonate content, but with a considerable sandy fraction, due to vigorous terrigenous apport of elastics. At the Early/Middle Oligocène boundary a universal subsidence set in, and in a pelagic environment the Kiscell Clay was de17