Macrocephalitid-bearing Lower Callovian (Middle Jurassic) beds in the Mecsek Mts (South Hungary)

Galácz, András (2015) Macrocephalitid-bearing Lower Callovian (Middle Jurassic) beds in the Mecsek Mts (South Hungary). Hantkeniana, 10. pp. 73-88. ISSN 1219-3933

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Abstract

In the former literature on the Jurassic of the Mecsek Mts it is traditionally taken as granted that the Middle Jurassic red, nodular, clayey limestone yields ’mixed’ Bathonian and Callovian (i.e. macrocephalitid) ammonites, thus stratigraphically was dated as ’Bathonian–Callovian’. A revision of the localities where macrocephalitids were previously recorded or recently found, resulted in a limited collection of well-localized ammonites. Evaluation of these ammonites led to the conclusion that Bathonian and Callovian faunal elements could be well-distinguished as coming from either the red nodular limestone or from the overlying yellowish, massive limestone. This latter can be firmly dated as earliest Callovian, on the basis of the co-occurrence of Bullatimorphites bullatus and Macrocephalites at least one locality, in the Mátépart ravine at the Hidas Valley. As for palaeogeography, the assemblages fit in well with the tendency of the Jurassic in southern Hungary, when lithological facies, and the faunal associations as well, show more and more Tethyan affinities as advancing in the Jurassic. The paper gives short descriptions of the localities and the most important ammonites of the Lower Callovian.

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