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

numerous, "but consists of a few species only. The strata overlying the Pteropoda-bearing bed already belong to the horizon of small Globigerinidae; they are readily identifiable with the equivalent part of the Sashegy Hill profile (samples N° 59-61). Both the plankton and the benthos are considerably poorer if compared to the previous horizon. Buliminae disappear completely (with the exception of 1-2 specimens), whereas representatives of the genera Nonion and Lenticulina (Eobulus) became more common. The planctonic Poraminifera are small in size (mostly 0,1 to 0,2 mm). The species Globigerina angiporoides Hornibrook becomes less numerous. On the contrary, no decrease can be observed in the abundance of the Globigerina praebulloides group and the species Globigerina cf. officinalis Subbotina. The rare planktoniferous intercalations in the "Tard" facies contain Globigerinae identical with those of the horizon of small Globigerinidae. These correspond in age to the upper part of the Hárshegy Sandstone, as a heteropic facies. Both in the southern foreland of the Bükk Mountains and in the Budapest region there is a gradual transition from the "Tard" deposits (which are devoid of foraminifers) to the horizon of small Globigerinae. In the vicinity of Noszvaj and Egerszalók a temporary continental phase seems to correspond to the latter. Lithologically, the formations of the Tard horizon and those of the horizon of small Globigerinidae are similar- to each other: clay with low carbonate content, clay with fine sand, often with abundant pyrite. The only difference consists in the more slaty texture of the Tard deposits. According to observations made by Drooger (1956)» Berggren (1969) and Hofker the Oligocène of North Europe contains smallsize planktonic forms. A diminution in size of the planktonlc foraminifers can be traced fairly well in the topmost Eocene -