Calpionellids and calcispheres from the upper Jurassic-lower Cretaceous deposits in the Resita-Moldova Noua zone, Southern Carpathians, Romania

An assemblage of calpionellids and calcispheres identified in five lithostratigraphic units allows the identification of eight biozones in the upper Oxfordian-Hauterivian interval. Since the biozonation according to calpionellids has already been accurately defined by Pop (1974, 1989) for the Marila Limestones and Crivina Marls, the novelty of our approach resides mainly in the extension of this biozonation to the over- and underlying lithostratigraphic units using calcispheres. The possibility of micropalaeontologically delimiting the Valea Aninei Limestones is extremely significant, since the age of these limestones has been estimated so far only by their geometrical setting in the lithostratigraphic sequence of formations in the area.