Özet:

The study area is located in 15 km west of Gercüş town (southeast of Batman) at the northern margin of the Arabian Plate. This region is the only place where Garzan formation, one of the important petroleum reservoir of the Southeastern Anatolia, outcrops and detailed scientific studies have been carried out. The unit, mainly of beige - yellowish, thin - thick bedded, benthic foraminifera and algae bearing limestones, has a rich fossil content and high diversity. This diversity in the benthic foraminifera is noteworthy. These assemblages contains Vandenbroekia munieri Marie, Coskinolina sp., Cyclogyra sp. with porcellaneous test; Biconcava bentori Hamaoui, Nezzazata simplex Omara, Nezzazatinella picardi (Henson), Trochospira avnimelechi Hamaoui, Antalyna korayi Farinacci and Köylüoğlu, Moncharmontia apenninica (De Castro), Moncharmontia compressa (De Castro), Fleuryana adriatica (De Castro), Pseudocyclammina sphaeroidea Gendrot, Broeckinella arabica Henson, Cuneolina pavonia d’Orbigny, Cuneolina ketini Inan, Dicyclina schlumbergeri Munier - Chalmas, Pseudolituonella reicheli Marie, Dictyoconella complanata Henson, Minouxia lobata Gendrot, Minouxia gümbelitrioides Marie, Arenobulimina sp. with microgranular and agglutinated tests and Fissoelphidium operculiferum Smout, Orbitoides medius (d’Archiac), Orbitoides megaloformis Papp and Küpper, Omphalocyclus anatoliensis Özcan, Sırtina orbitoidiformis Brönnimann and Wirtz, Goupillaudina sp. with hyaline test. In this study, the age of Garzan formation has been determined as Maastrichtian based on benthic foraminifera.

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