Writers : Vahidinia,Mohammad;Sadeghi,Abbas;Shemirani,Ahmad;Ariaee,Aliasghar;Adabi,Mohammad Hoseyn
Refference : 11th Symposium Of Geological Society Of Iran - Mashhad, Ferdowsi University
Publishing Year : 1386

Abstract :

The Kalat Formation is well exposed and cliff forming in the eastern Kopet-Dagh basin . This Formation is composed mainly of sandy Limestone, bioclastic Limestone, Sandstone and Shale. In Tang-e Chahchaheh section, the thickness of the Kalat Formation is 169.5 m . Despite of thickness reduction in Kalat Formation at this location, the six member can be identified . As type locality, the lower boundary of the Kalat Formation with the Neyzar Formation is disconformable (as a Paleosol). The upper boundary of the Kalat Formation with the Pestehleigh Formation is disconformable and probably with a gap.
Two types of lithofacies including Siliciclastic and Carbonate were identified in the Kalat Formation. The siliciclastic parts of the Kalat Formation may have been deposited in a Shoreline environment, while the carbonate parts have been deposited in a shallow carbonate-platform (Ramp type).
In this present hnvestigation, in addition, 38 genera and 27 species of benthonic and planktonic microfossils have been identified. On the base of index–fossils such as Siderolites calcitrapoides, Gansserina gansseri, Rugoglobigerina rugosa, the Late Maastrichtian age for the Kalat Formation can be determined.

Subject List : biostratigraphy