Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 77. (Budapest 1985)
Kordos-Szakály, M. ; Kordos, L.: Morphotypes of Hungarian fossil Celtis (Urticales) stones
100% Rudabánya 10 50 Pannonhalma Tardo « P agárd i Oaztramos Tarkó C»a rnóta2,3 Podumci Oazli.U Porlyuk Dunaal m*a 4 •VMI, 6 Sütto Ber amand Köm«. Lan*r__C. Upp on y I 3 2 1 ~ O'mill. Is UPPER MIOCÉN E PLIOCENE PLEISTOCENE Aga —jr Lowa r Pannonian | Uppar PannL. I ». I U. L. I M. I U. Aga —jr vaphara biozona— 7 . primitive subzona - macro ravol"* *~ * vo1 ^ aubzoneV" racartt o Fig. 6. Frequency of the examined fossil fruit remains through time and the biozones of Celtis with their geochronological correlation Celtis "evolution" subzone: This period can be characterized by an increased size growth and among the different morphotypes by the development of an already individual more complicated (characteristic) surface pattern. Besides the dominance of the sphere types at certain localities, a considerable increase of the number of torpedo, pillow and oval morphotypes can be observed rather frequently. It can be identified with the Middle Pleistocene. Celtis "evolved" s u b z o n e : The surface pattern of the different morphotypes showed only slight variability, the dimensions of the stony endocarp are maximal, in its wall an unambiguous textural differentiation can be observed. It can be identified with the Upper Pleistocene. Within this period its upper boundary is marked by the disappearance of Celtis in Central Europe, which in Hungary can be put to the end of the Riss/Würm interglacial. Celtis "recent" subzone: The recent species belong to this subzone. The lower boundary of this subzone is not known exactly since subfossil material which could be of help to connect the morphology of the stony endocarps of the recent species with those of the latest known Pleistocene species is not available. With help of the two biozones and six subzones based on the Celtis remains found recently in a great quantity now the biostratigraphical position and geological age of the fossil-bearing rocks can be determined.
