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Three species of Cassiopidae (Cerithioidea, Gastropoda) are described from outcrops in the vicinity of the villages Rastište and Mokra Gora in western Serbia. They occur in marly limestones of near shore shallow water deposits. Earlier micropaleontological investigations have indicated an Albian-Cenomanian age. The species encountered are related to those present in deposits of the European margin of the Tethys and closest relationships exist to those of the Armenian and Transcaucasian region. Our species can be placed in the genera Cassiope, Paraglauconia and Bicarinella. A new species Cassiope kotromanensis is erected. Assumptions about post-mortem shell transport and size sorting of gastropod shells were examined through statistical analysis

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' (RADOIČIĆ 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 Kamišna Member occupy the lower part, nodular bedded marly limestone of the Uroševići 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

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An attempt was made to describe two parasequences separated within the sediments of the Kotroman Formation at the Mokra Gora Village in western Serbia. The whole formation, of Albian-Cenomanian age, in some general characteristics corresponds to tidal flats, some of which were described in the literature (LARSONNEUR 1975), and the sediments were compared with ones from recent tidal flat environments. The heterogeneous composition of the Kotroman Formation influenced different authors to describe several non-synchronous and incomparable superpositioned packages. The parasequences were investigated in the attempt to correlate them with the stratigraphic age of the members. The parasequences were formed during the Albian transgression and represent a gradual deepening of the wider area. Well-developed flooding surfaces with significant deepening indicated retrogradational stacking of certain transgressive system tracts and reflect landward movement of the shoreline, indicating a gradual sea level rise