Biostratigraphy study of Tarbur Formation (upper cretaceous) in Tang-E Kushk and east of Sarvestan (SW of Iran)

Abstract

In this study, 465 m of Tarbur Formation in Tang-e Kushk and east of Sarvestan area stratigraphic sections are studied and 185 thin sections are provided and analyzed. Based on lithostratigraphic studies, Tarbur Formation in these two stratigraphic sections is divided into upper and lower parts. Lower part includes medium-bedded rudist limestones which is consist of iron nodules with Gastropoda. Upper part is made of light grey massive organodetrital limestone. Identified foraminifers of both studied sections are comprised of: Orbitoides media, Orbitoides triangularis, Orbitoides tissoti, Orbitoides orientalis, Orbitoides apiculata, Antalyna korayi, Rotalia skourensis, Dicyclina schlumbergeri, Nezzazatinella sp., Omphalocyclus macroporus, Trochospira sp., Siderolites calcitrapoides, Broeckinella sp., Lepidorbitoides socialis, Gavelinella pertusa, are detected, and also it has Dasycladacea of Salpingoporella dinarica, Salpingoporella turgida, Salpingoporella sp.. According to diagnosed foraminifera, the age determination of Tarbur Formation is assigned to Upper Maastrichtian.

Keywords

Maastrichtian / Tarbur Formation / biostratigraphy / foraminifera / Zagros / Iran

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