-

The Kalat formation, the youngest unit of the Upper cretaceous of the Kopet Dagh Basin is mainly composed of sandy limestones with a few sandstone and mudstone beds. In this study five stratigraphy sections were measured in the Sarakhs area.
The thickness of this formation decrease eastwards, so that in the tange- Neyzar (Type section) it is 285 meters thick but in the easternmost section (pas-kamar) its thickness decreases to 86 meters. Microscopic investigations indicated five microfacies grous that in a seaward direction include:
A1 : Rudistid Biolithite
A2: pelecypod, Redagal. Biosparite
B1 : oosparite
B2: Bryozoan, Redagal, Echinoderm Biosparudite
C : Red algal, Echinoderm Biosparite
Field and microscopic studies indicated that these microfacies a were deposited in there sub-environment (Logoun (A1, A2), Bar (B1, B2), and open marine (C)). Two clastic facies (Shale-mar land sandstone) were also recognized. Most of the shale marl in the middle part and the upper part of the formation, is covered. Shale's in the middle part of the kalat formation with miliolids and Rota lids were deposited in a lagoonal environment, but those of the upper part with globotruncana forams were probably deposited in a deeper marine environment.
The sandstones (mature-sub mature litharenite), which accur in the upper part of the formation show a transitional marine and perhaps a beach environment.