Age and palaeoenvironment of the spherulite-bearing polány Marl Formation (Upper Cretaceous, Hungary) on basis of palynological and nannoplankton investigation

Spherulites and spherulite like forms microlapilli found in formations of different ages may be indicators of geological events in extraterrestrial space and faraway areas of the Earth. The age and conditions of embedding can he deciphered by investigating the enclosing rocks. Studying the Upper Cretaceous in this way may be of special importance in tracing the latest Cretaceous extinction as well. The borehole Nagygörbö-1 can be considered as the "Spherulite-reference section" in the Upper Cretaceous Polány Marl Formation, because the spherulites described by VASKÓ-DÁVID (1994) occurred in these biostratigraphically well determined host sediments (SIEGL-FARKAS and WAGREICH, 1994).