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

Abstract

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

Deciphering the geodynamic evolution of the Dinaric orogen through the study of the ‘overstepping’ Cretaceous successions

“…The lower portion of the succession was measured at Vardište, a little village north of the railway station (section 1; 43°45 0 40.0″ N 19°27 0 29.1″ Esame outcrops studied by Bortolotti et al 1971) and in the vicinity of Kotroman village (section 2: 43°46 0 01.0″ N 19°28 0 07.2″ E; section 3: 43°46 0 05.0″ N 19°28 0 22.4″ E); the middle and upper portions of the succession were studied on the eastern flank of Tusto Brdo (section 4: 43°46 0 37.1″ N 19°28 0 36.2″ E) and on the southern slope of Ograđenica Hill (section 5: 43°46 0 59.9″ N 19°28 0 54.5″ E) and south of Kotroman village (section 2b: 43°46 0 06.6″ N 19°27 0 54.6″ E) ( lithostratigraphic studies were performed only on the Vardište section by Bortolotti et al (1971). Other studies focused on a general description of the main lithostratigraphic units and their respective biostratigraphic assemblages and gave no precise stratigraphic location for the samples collected and studied (Pejović & Radoičić, 1971;Banjac et al 2007Banjac et al , 2008Radoičić & Schlagintweit, 2007). As a consequence, in some cases it was impossible to make a reliable correlation of the biostratigraphic data, especially in the lower portion of the succession, as previous workers recognized the presence of only one deepening-shallowing cycle.…”

“…Pejović & Radoičić (1971) and Radoičić (1984) placed the lower part of the Mokra Gora succession (Unit B) as older than Cenomanian, and indicated a late Turonian to latest Cretaceous age for the upper part represented by massive limestones with hippuritids and gastropods (Unit C). Banjac (1994aBanjac ( ,b, 2000 and Banjac et al (2007Banjac et al ( , 2008 described Albian-Cenomanian mollusc faunas from the lower part of the succession. The same age was confirmed by I. Dulić (unpub.…”

Paraseqences in the Kotroman Formation, Western Serbia

“…The first of the aforementioned, the so-called Basal terrigenous sandy series, was described by Banjac et al (2008), and proposed as the Kotroman Formation. The Formation consists of clastic deposits in the lower part and limestone beds in the upper part of the stratigraphic column.…”

“…Within the Uroševići Mb., two parasequences have been described, with an attempt to correlate them with stratigraphic age of the member (BANJAC et al 2008).…”