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

FRAGMENTA PALAEONTOLOGICA HUNGARICA 20, BUDAPEST, 2002 Data to revision and distribution of small foraminifera species described by HANTKEN (1868, 1875) Part I, Textulariidae and Miliolidae by Mária HORVÁTH Abstract — Only 40 original specimens of HANTKEN'S species remained in Hungarian collections. Recently, I have studied 13 species described by HANTKEN (1868, 1875a, b). In this work the systematic position, diagnosis, stratigraphical range and scanning electron microscope photos of these species are given. These species belong to the Textulariida and the Miliolida. Key words — HANTKEN's small foraminifers, "Clavulina Szabói" layers, diagnoses, types, stratigraphy, ecology, Eocene, Oligocène. HORVÁTH, M. (2002): Data to revision and distribution of small foraminifera species described by HANTKEN (1868, 1875). Pan I, Textulariidae and Miliolidae. — Fragmenta Palaeontologica Hungarica, 20: 25-42 Introduction In the 19

th century Miksa rlANTKEN played a leading role in the collection and description of the microorganisms, mainly foraminifers. Its monograph on the fossil Foraminifera of Middle Eocene sediments, Buda Marl and Kiscell Clay Formations ({'Clavulina Szabói layers") was published in 1875. With the employment of the scanning electron microscope (SEM), documentation of the remains of the original collection has been elevated. This advance justifies a revision of HANTKEN's work. The subject of this work is the re-examination of the foraminifera species described by IdANTKEN in "A Clavulina Szabói rétegek faunája. L Foraminifera" (Die Fauna der Clavulina Szabói Schichten. I. Theil Foramiriiferen) published in a volume of the Annales of the Hungarian Royal Geological Institute in 1875. This work belongs to the fundamental foraminifera literature of the 1800-ies. Value of this composition can be compared only with the works of the greatest micropaleontologists of the 19

th century. While REUSS and GÜMBEL worked in German territories, D'ORBIGNY investigated and described several species of the Middle Miocene (Badenian) formations of the Vienna Basin. IdANTKEN studied the Hungarian Eocene and Oligocène formations, mainly the area of the Transdanubian Central Range. At that time, significant building operations were carried out in the areas of Pest, Buda, and Óbuda (later unified as "Budapest"). The necessary building materials were mined in the brickyards of Óbuda (NW Budapest), that is partly a recultivated area today, partly a modern residential section therefore the classical localities are not accesible. Nowadays Kiscell Clay is mined only at Törökbálint and Pilisborosjenő, in the environs of Budapest. Buda Marl can also be sampled only during the founding process of constructions. Material, methods Due to the classic localities are not accessible, material of the present work comprises the collections of previous years, completed by findings of the last three years. Nowadays, wellpreserved and "photogenic" faunas can be collected only in the environs of Eger (Kiseged, Noszvaj and N Hungary). Specimens of the faunas at Törökbálint and Pilisborosjenő have recrystallized shells, so they are less suitable for taking of photographs. Materials from HANTKEN's Collections have been preserved at several places, including the Department of General and Historical Geology, the Department of Palaeontology of the Eötvös Loránd University at Budapest; in the Museum of the Hungarian Geological Institute (Table 1), as well as the collection of the N amrhistorisches Museum in Vienna, Austria. The original collections consisted of tiny bottles, fixed on wooden planks. Corks closed the bottles, and the names and localities were indicated beside them. On the bottom of the plank, below the bottles, even the drawings of the specimens were placed It is important to note that in these phials not only the species, held by IdANTKEN as new ones, but also the sp>ecimens of those frequent species of the Buda Marl and Kiscell Clay were stored, which had been previously described by others (mainly GÜMBEL, REUSS, D'ORBIGNY). More or less specimens of the frequent species, have been preserved in the Hungarian traceable collections, however, there is no marked type specimen (holotype) among them. Having appreciated IdANTKEN's life work, László MAJZON