Góczán, F.; Oravecz-Scheffer, A. (1996). Tuvalian sequences of the Balaton Highland and the Zsambek Basin. Part 2. Characterization of sporomorph and foraminifer assemblages, biostratigraphic, paleogeographic and geohistoric conclusions. Acta Geologica Hungarica. 39(1): 33-101.

336997

Góczán, F.; Oravecz-Scheffer, A.

1996

39(1): 33-101

Publication

We analyzed the Tuvalian foraminifer and sporomorph assemblages occurring in the Carnian formations of outcrops and boreholes drilled in the Balaton Highland and the Zsámbék Basin, from biostratigraphic and palaeogeographic points of view. Having studied their dominance relations and their ranges, besides the taxa occurring throughout the Carnian and entering in the Julian, it was found that those which appear in the Tuvalian but reach their dominance at the end of the Triassic and in the Liassic, respectively, proved to be characteristic of the Tuvalian substage, as well as those which have been known only from Tuvalian formations so far. Palynologic analyses from a palaeogeographic point of view resulted in the interpretation that the Carnian basins of the Balaton Highland and of Zsámbék had developed separately from each other, as parts of two terranes; the former close to the southern coastal region of Tethys, and the latter near the northern one, from the Julian to the beginning of the Middle-Upper Tuvalian, when they came into proximity of each other for the first time. During the sedimentation of the Main Dolomite, they occurred already as a single terrane. Among the newly-found taxa, two sporomorphs and two foraminifera have been palaeontologically described, and the taxonomic position of two foraminifer species has been discussed.

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