The first record of Microcodium from Maastrichtian Kalat Formation, Kopet-Dagh sedimentary basin, NE Iran: biostratigraphy and microfacies

Document Type: Original paper (Research paper)


1 Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran

2 University of Belgrade, Faculty of Geography. Belgrade, Serbia

3 Geological Survey of Iran, NE territory, Mashhad, Iran


The biostratigraphy of the Maastrichtian Kalat Formation cropping out in the Karnaveh area of the northeastern Iranian Kopet-Dagh sedimentary basin is presented. Micropaleontological studies led to the determination of micro-calcite structures, Microcodium deposited in the stratigraphic section due to transgression and regression of the sea. On the basis of determined benthic foraminiferal taxa Laffitteina mengaudi (Astre), Lepidorbitoides socialis  (Leymerie), Omphalocyclus macroporus (Lamarck), Orbitoides apiculata Schlumberger, Orbitoides media (d’Archiac), Rotalia skourensis Pfender, Siderolites calcitrapoides Lamarck, Sirtina orbitoidiformis Brönnimann & Wirz, Sulcoperculina cosdeni Applin & Jordan, Sulcoperculina globosa Cizancourt andSulcoperculina vermunti (Thiadens) the Kalat Formation in the studied stratigraphic section is assigned to the Maastrichtian. The current study represents the first record of Microcodium occurrence in Kopet-Dagh sedimentary basin in northeast Iran and therefore expands the current knowledge on its palaeogeographical distribution in the Tethyan Realm.