Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 5. 1974. (Budapest, 1974)

The most common forms are Turborotalia munda

, Catapsydrax cf. dissimilis

, Globi gerina angustiumbilicata

, G. euapertura

, G. officinalis

, the G

. praebulloide

s group and G. senilis

. In the topmost part of the zone Globigerina ouachitaensis gnaucki and G.ou. ciperoensis become common. The thickness of the zone (the upper part only!) in the southern foreland of the Bükk Mountains is 400 to 500 m, in the vicinity of Budapest about 1000 m. Turborotalia obesa Zone Author

: SZTRÁKOS, in this work Definition: From the first Turborotalia obesa up to the first Globigerina angulisuturalis

. Remarks: On the basis of Borehole Bogács-1. in 5 m above the first Turborotalia obesa appears also the first typical Turborotalia opima opima. The Globigerina ampliapertura, together with the G. euapertura disappears in the upper part of the profile, but this possibly can be due also to the facies change caused by emergence. In Northern Europe Globigerina euapertura and the typical G. ampliapertura diappears at the middle of the Chattian. The Globigerina anguliofficinalis - G. angulisuturalis transitions appear at the base of this zone. CICHA et al. (1971) mention that in the Steinitz-Ausspitz Series <Czechoslovakia) Globigerina angulisuturalis appears together with Turborotalia opima nana - T. opima opima transitions, and with Globigerina ouachitaensis ouachitaensis and Turborotalia obesa

. On the basis of these facts the upper boundary of the zone falls within the Oligocène. At the base of the zone appears the earliest Globigerinoides

, and Globigerina aff

. ouachitaeniss, G. euapertura

, the G. praebulloide s group and Turborotalia munda are common. In the upper part common forms are also Turborotalia opima opima and T. opima nana

. The uppermost part of the zone is unknown in Hungary. In this area a general upfilt occured i.e. the upper part of the Egerian is represented by brackish-water to terrestrial sediments

. The lower boundary of the zone coincides with the Rupelian/Egerian boundary. The thickness of the party yielded planctonic foraminifers is 70 to 100 m in the southers foreland of the Bükk Mountains.