Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 5. 1974. (Budapest, 1974)
hole Rózsadomb-8/3, Globigerina ouachitaensis gnaucki is common from the lower part of the zone onwards, and relying upon this, the beginning of the zone can be defined. The thickness of this part is 8 m, and this is overlain by a horizon (thickness 2 to 3 m,) in which the species Turborotalia liverovskae , T. brevispira , Globigerina officinalis and G. praebulloides are common. The change can be due to deteriorated life conditions. The closing of this part of the basin led to the development of euxinic facies. This closing seems to have influenced more intensely the area of the Bükk Mountains, thus the firstmentioned gnaucki population is absent, and only the latter liverovskae - offici nalis population does occur. The thickness of the foraminifer bearing part ranged into this zone is 11 - 15 m in both areas. The upper part of the zone is unknown, because of the foraminifer extinction caused by facies change, but, according to the original definition and considering the data of BERGGREN (1969b), the upper limit would coincide with the Lower/Middle Oligocène boundary. In his recent work CAVELIER (1972) proved that the nannoplanktonic Ericsonia subdisticha Zone ranges still into the Upper Eocene. BAUMANN (1970) observed in Visso (Apennines) limestone intercalations in this zone with Discocyclina , Spiroclypeus and Fabiania, as well as a planktonic fauna equivalent to P 17 sensu BLOW. It is proved in North European regions that the beds ranged into the Ericsonia subdisticha NP Zone (as well as the stratotype of the Latdorfian) contain a warm-water fauna, while the fauna of the overlying beds is of cooler water. This climatic change can also be traced in the more continuous profile in Hungary, thus the boundary between the Turborotalia increbescens and Globigerina postcretacea Zones - just defined with this very climatic change - corresponds to the Eocene /Oligocène boundary. Turborotalia munda Zone Author : SZTRÁKOS, in this work Definition: From the first appearance of Globigerina euapertura up to the first Turborotalia obesa. Remarks : Only the upper part of this zone is known in Hungary, because the Tard Clay/ Kiscell Clay facies boundary falls within this zone. Globigerina euapertura and Turborotalia munda can be found even in the lowermost samples of the Kiscell Clay. Globige rina ouachitaensis ciperoensis appears in the lower quarter of the Kiscell Clay, later than both in tropical and North European regions. Togetftsr with Globigerina ouachi taensis ciperoensis appear the transitional forms of Turborotalia munda and T. obesa . Table III. Distribution of planktonic Foraminifera in the Upper Paleogene of NE-Hungaryin. táblázat. A plankton foraminiferák eloszlása az északkelet-magyarországi felsôpaleogénben.
