Abstract
The asymmetric rhynchonellide brachiopod Cyclothyris? globata (ARNAUD, 1877) has a large distribution in the Coniacian, Santonian and Campanian outcrops of the western Tethys. The species has also been identified in Guca, (Vardar Zone, western Serbia), where it occurs together with the capillate terebratuloid ?Terebratula? sp. (gen. et sp. nov.). In addition to Serbia, this brachiopod association is found in many localities of northeastern Bulgaria (Shumen Formation). In older literature, in Romania and Bulgaria, ?Terebratula? sp. (gen. et sp. nov.) was confused with the Late Maastrichtian Terebratulina striata (WAHLENBERG, 1821). The present microfaunal study based on planktonic foraminifera showed that the age of the beds with Cyclothyris? globata and ?Terebratula? sp. (gen. et sp. nov.) in Guca may be dated as Lowermost Campanian, i.e., the Santonian/Campanian boundary.
Highlights
A brachiopod assemblage of two species, i.e., Cyclothyris? globata (ARNAUD) and “Terebratula” sp., was found in the Upper Cretaceous succession at the Dupljaj Stream, near Guča, in the Bjelica Belt of the Vardar Zone (Fig. 1)
In several localities of the Vardar Zone (Guča, western Serbia) and the Balkans, C.? globata was found in assemblages with the capillate “Terebratula” sp., which previously was misidentified with the Late Maastrichtian Terebratulina striata (WAHLENBERG)
The Campanian age of Hemicyclammina chalmasi is based on planktonic foraminifera in the limestone with planktonic and benthic foraminifera (POLAVDER 2003)
Summary
A brachiopod assemblage of two species, i.e., Cyclothyris? globata (ARNAUD) and “Terebratula” sp. (gen. et sp. nov.), was found in the Upper Cretaceous succession at the Dupljaj Stream, near Guča, in the Bjelica Belt of the Vardar Zone (western Serbia) (Fig. 1). Nov.), was found in the Upper Cretaceous succession at the Dupljaj Stream, near Guča, in the Bjelica Belt of the Vardar Zone (western Serbia) (Fig. 1). The. The Cretaceous of Jelica Mt. is designated on the geological map in two belts of different developments: Jelica I (assigned to the Inner Dinarides) with a succession similar to the Bjelica Belt, and Jelica II (assigned to the Vardar Zone) with only a Middle Campanian Diabase-Chert Formation present (BRKOVIĆ et al 1978, Fig. 4). Why the (Jurassic) Diabase-Chert Formation was dated Campanian and what kind of deposits were developed there are the questions answered in the controversial text “Senonian of the Vardar Zone”, as follows (translation from Serbian): “Senonian rocks in the Vardar Zone are represented by a particular Diabase-Chert Formation They form a narrow, discontinuous belt along the Jelica Range, in a zone of intensive structural deformation, thereby in structural unconformity with adjacent units” “These rocks are rudistid in character (sic!) in a chaotic arrangement of units of ill-defined beds. The species is known from the Santonian-Campanian of Romania (southern Dobrudja, Remus Opreanu; NEAGU & BĂRBULESCU 1979; BĂRBULESCU et al 1979; BĂRBULESCU & NEAGU, 1988), the Latemost Santonian of northeastern Bulgaria (CANKOV 1930, ZACHARIEVA-KOVAČEVA 1947; JOLKIČEV 1989; MOTCHUROVA-DEKOVA 1996a), the Campanian and Maastrichtian of the Crimea and the Caucasus (ASTAF’EVA 1959)
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