Writers : Taherpour Khalil Abad,Morteza; Aryaei; Ali Asghar; Ashouri; Alireza,Hosseini, Seyed Abolfazl
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

The Tirgan Formation is a Lower Cretaceous succession in the Kopet Dagh Basin in North East of Iran which lithologically mainly consists of micritic limestones, thick layers of biomicritic limestones, shaly limestones, marly limestones and biosparite limestones. Micropaleontological investigation has been carried out on some 85 surface samples from the Arkan exposure near the Bojnourd city. This study includes both macrofossils (echinoderms, brachiopods, lamellibranches) as well as microfossils (assemblages of benthic foraminifera, calcareous algae). These criteria reveal that an equivalent of the Urgonian facies type (in France-Swiss area) and open marine, low depth sedimentary basin are extended in the Kopet-Dagh Basin. In this article, we tried to introduce some of the important foraminiferal assemblages of this area.

Subject List : Foraminifera, Orogonian facies