Palynologic Investigations on the freshwater limestone layer of Lábatlan, and an attempt to divide the Hungarian lower eocene floras on palynologic basis (dedikált példány) [antikvár]

PALYNOLOGIC INVESTIGATIONS ON THE FRESHWATER LIMESTONE LAYER OF LÁBATLAN, AND AN ATTEMPT TO DIVIDE THE HUNGARIAN LOWER EOCENE FLORAS ON PALYNOLOGIC BASISByM. KedvesInstitute for Botany of the University, Szeged, Hungary (Dir.: Prof. Dr. P. Greguss)IntroductionThe Hungarian analytical investigations on pollen of the Lower Eocene (Sparnat) are restricted up to now mostly to the coal basin of, Dorog (5, 6). But we have also data about the Lower Eocene of Halimba (3, 7) and H. Deák (2) gives us in her paper on the Bauxit of G á n t some information about that territory. The investigations on the Lower Eocene coal deposits of Dorog, on those of Halimba (5, 6, 7), and the as yet unpublished results of the observations made on the strata of the Lower Eocene of Dudar have raised up numerous problems:1.Was the Lower Eocene flora of Hungary uniform or were at least the dominating elements generally distributed?2.Did an identical vegetation contribute to the formation of coal deposits of identical age, i. e. were the ecological conditions at a given time identical?3.Is it thus possible to identify all the Lower Eocene strata of Hungary on a palynological basis by their pollenspectra ; or are the results of pollen stratigraphy valid only to certain territories, in an identical age (Lower Eocene)?4. Is it possible to characterize an age by individual spores and pollen or by their associations, respectively, by a stratigraphic diagram, constructed on the basis of the pollen spectra synthetisation of the contemporary fossil floras of the different territories?Essentially, the above mentioned problems are connected with the fundamental theses of pollen stratigraphy, however, we have also to deal with them from a critical point of view so as not to draw erroneous stratigraphic conclusions from some local differences.Material and MethodTo solve these problems, it seemed most suitable to investigate the Lower Eocene freshwater limestone of Lábatlan. I want here to express my appreciation to Dr. I. Miháltz who supplied me with the material for the investigations. The sample had been taken east of the cement works of Lábatlan, from the somewhat discordantly settled freshwater limestone layers underneath the gravelly-sandy bed of the sandpit on the eastern part of the valley.The preparation has been done with dil. HNOs, quantity of material used: 5 g.