Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 90. (Budapest 1998)

Dulai, A.: Early Jurassic brachiopods from the basal layers of the Pisznice Limestone of Lábatlan (Gerecse Mts, Hungary)

There are several brachiopod species in the upper, thin-bedded unit of the Vöröshíd quarry, which are absent at the Tölgyhát quarry and Póckő localities (e.g. Linguithyris aspasia, Apringia paolii, Pisirhynchia pisoides, Pisirhynchia retroplicata, Liospiriferina aequiglobata etc). On the basis of these facts, the examined layers of the Tölgyhát quarry and Póckő (the lower 3.5 m above the boundary between the Triassic and the Jurassic formations) can be correlated with the lower, thick-bedded part of the Vöröshíd quarry. Of course, in the absence of ammonites in both area, this correlation based on the distribution of the brachiopod species remains slightly uncertain. AGE OF THE FAUNA In the absence of ammonoids, the age of these layers can only be deduced from the distribution of brachiopods. Herein, the stratigraphie ranges of the examined brachiopod species is given on the basis of ALMÉRAS (1964) fundamental work, but in some cases it is complemented with more recent Hungarian data from the Bakony Mts. (VÖRÖS 1983«, DULAI 1993/?) (Fig. 14). Fig. 15. Scatter diagram of relationship of width to length in Calcirhynchia plicatissima