Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 20. 2002. (Budapest, 2002)

(1962b) attempted a revision, but only on the basis of the depictions. His great experience helped him to find systematic position of the majority of the species, being still valid or approximately valid. However, he also did not indicate types. According to GELIAI-NAGY (1988), the collections that have remained in Hungary contain 111 small foraminrfer fossil types (species) in fixation. Out of them, I selected 31 species, indicated by HANTKEN as new ones, with the aim of describing and taking photos of them. On this basis, work of GELLAI-NAGY "Delineation of HANTKEN's foraminiferal species from the original collection" was composed for the XXP European Micropaleontological Colloquium in 1989. This work contains the scanning electron microscope shots of 35 taxa, deriving from the original coUections. Compared to it, the present study gives also the description of 13 species, belonging to Textulariidae and Miliolidae with SEM photos. The SEM photos were taken by AMRAY 18301/76. type microscope, in the Microscope Laboratory of the Petrological and Geochemical Department of Eötvös University, with the leading Kamilla GAÁL-SOLYMOS. The classification of benthic foraminifera, applied in this volume, follows that of LOEBLICH & TAPPAN (1988). The material studied in the present work is deposited in the Geological and Paleontological Department of the Hungarian Natural History Museum under the inventory numbers M.99.39-44 and M.99.47-49 Localities, geology HANTKEN's localities As HANTKEN said, the Clavulina Szabói layers "...represent an independent class of the Tertiary formation". According to the author they range from Porva (V

eszprém County) to Recsk (Mátra Mountains) (Table 1), from Padrag Marl to Szécsény Schlier (Table 2). The richest fauna localities according to the exposure conditions of 1875: - Ujlak brickyard, Óbuda; - ground-plot of the Lónyay House on the Albrecht road of the Vár-hegy (Budapest, today: Hunyadi János street); - the sunk road in the East side of the Kis-Sváb-hegy, besides the Balássy vineyard; - the road to the old coal rnines at Mogyorós; - the public road between village and the Lábatlan creek at Piszke; - the quarry at the fringe of the Szápár forest at Csemye. Rocks of the Clavulina Szabói layers in IdANTKEN'S description: tályag (=clay), marl, marly limestone, subordinately clayey sandstone. In some places, there is considerable quantity of glauconite that fills also the shells. "The tályag contains organic remnants of microscopic size in a great amount". In the environs of Buda, its underlying rock is the "Orbitoid limestone", which, according to the evidence of the Kis-Sváb-hegy and Szépvölgy quarries, grades into "the Buda Marl fonriing the lower class of the Clavulina Szabói layers, from which it can be distinguished rather petrographically than paleontologically". In the description of HANTKEN, the Clavulina Szabói layers are divided into two main classes; its upper part consists of clay, while their lower part is marl. In the environs of Buda, the lower part is represented by the Buda Marl and the upper part by the "Kis-czell tályag ", respectively. Formations, bearing HANTKEN's foraminifers The Buda Marl — The Buda Marl is dominantly a light grey or light brown (weathered) silty marlstone, marly siltstone. It is often well-bedded. The average of the CaC03 content is 35-40 %. Graded limestones (allodapic limestones) are mterbedded in the lower-middle part of the formation (VARGA 1984). The lower contact of these beds is sharp, whereas the uppermost part grades upward gradually to the marly beds. Within each limestone bed, gradation is observable with oysters and peainids in the lowermost layer and small Nummulites fabianii specimens in the middle part (BÁLDI, 1986). The thickness of these allodapic beds is 0.5-1.0 m; and the complete thickness of the Buda Marl remains below 100 m. The area of its occurrence extends from the Transdanubian Central Range to the Bükk Mts. In the Budapest area the Bryozoa Marl (Priabonian) grades upward into the Buda Marl. And the Buda Marl grades upward into the Tard Clay. Molluscs, large and small foraminifers, and calcareous nannoplankton indicate the biostratigraphic position of the Buda Marl. The main part belong to the Priabonian stage (NP 19-20, P17; Báldi 1986, B.-BEKE 1972; KECSKEMÉTI & VARGA 1985) However, the uppermost part of the formation is Early Oligocène by the data of calcareous nannoplankton and planktonic foraminifers (NP 21-22, P18) (NAGYMAROSY 1992, HORVÁTH 1998). Two types of small foraniiniferal assemblages can be separated in the formation. The first is a GlobigerinaGemellides assemblage with many benthic and planktonic specimens. The abundant taxa are Cyclammina, Tritaxia, Vulvulina, Gemellides eocaenus, Gemellides costatus, Uvigerina eocaena, Uvigerina spinicostata, Uvigerina cocoaensis, Gavelinella asterians, Korobkovella grosserugosa, Almaena, Asterigerinata, Queraltina, Turborotalia ampliapertura, Turborotalia mainly Subbotina eocaena, Subbotina corpulenta, Turborotalia ampliapertura, Dentoglobigerina prasaepis, Globigerina qffiánalis, Gbbigerina praebulloides, small tenuitellinids, criuoguemL^lirricls, Bulimina sculptais, Bulimina alazanensis, increbescens, Subbotina tripartita, Subbotina linaperta and Subbotina eocaena. These forarninifers indicate bathyal bottom conditions (600-1000 m depth) and normal salinity.