The Albian-Cenomanian Kotroman Formation of Mokra Gora (Western Serbia)

Cretaceous deposits in the wider area of Mokra Gora village (western Serbia) were studied previously during basic, thematic mapping and detailed metallogenic investigations. These former studies neither distinguished the clearly defined formations, nor defined the lower rank lithostratigraphic units. The oldest Cretaceous formation in the area of Mokra Gora, the 'Basal series', lies above peridotite and serpentinite and below the 'Hemipelagic series' (RADOI I 1995, and references therein). This study preliminary defines the 'Basal series' as a formation and proposes the lithostratigraphic term 'Kotroman Formation'. The stratigraphic column of the Kotroman Formation consists of three separate members of lower rank. The ferruginous sandstone and conglomerate of the Kami na Member occupy the lower part, nodular bedded marly limestone of the Uro evi i Member are in the middle part and thin bedded bioclastic limestone of the Jatare Member made up the upper part of the formation. Fossils are represented by sporadic assemblages of mollusks, foraminifers, algae, brackish water charophytes and ostracodes, which indicate an Albian-Cenomanian age of the formation.