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

In a greater depth have been deposited those beds in which the two species Cylindroclavulina cylindrica (Hantken 1875) and "Ehynchospira" abnormis Hantken abound. In this assemblage the benthos predominates, with numerous arenaceous (agglutinate) forms. For the Várhegy Hill occurrence (Lonyai-groundpiece

, Hantken I871) water depth was estimated by E.Dudich (1959) - on the basis of the bryozoan fauna, - to have been about 100 m. In the interior of the basin occur: Bolivinellae, small specimens of Tubulogerina eocaena (Gümbel), Orthomorphina rohri (Cushmand and Stainforth)

, Eeussella eocaena (Cushman)

, Uvigerina eocaena Gümbel, Coleites reticulosus (Plummer), Anomalina crassisepta Cushman and Siegfus, Queraltina epistominoides Marie. The abundance of the planktonic forms is equal,or superior to that of the benthos. The "lower Pteropoda-bearing bed" (with Balantia, Lorenthey 1909) belongs to the Cylindroclavulina cylindrica Zone. Bryozoans and Echinoderms are common in the deposits of the Cylindroclavulina cylindrica Zone. Lithologically

, calcareous marls and marls predominate* The benthonic foraminifera enumerated above suggest rather Late Eocene than Early Oligocène age. 2. Eocene/Oligocene transition. This horizon develops gradually from the previous one. The Eocene/Oligocene boundary is to be traced within these strata. In the lower part, several species indicative of the Eocene are still present, such as Alabamina oschmanni Hagn, Anomalinoides capitatus (Gümbel), Orthomorphina rohri (Cushman and Stainforth), Nummulites of. incrassatus- de la Harpe, Operculina sp. Above the presumed boundary only "transitory"(persistent

) forms could be found. In the Budapest region a characteristic feature of this horizon is the abundance of Bulimina species (B. aksu-