The studied section is located in Central Iran, in 35km southeast of Shahreza in Ramsheh area. The Ramsheh area structurally belongs to the southwest Central Iran including the Shahreza- Abadeh- Hambast belt, which is separated by faults from the Gavkhoni- Abarquh depression to the northeast and from the Yazdekhast-Dehbid metamorphism belt to the southeast.The Carboniferous deposits with 620m thickness including Shishtu2 and sardar Formations, the former (Shishtu2 Fm), mainly consists of 315m dark to gray limestones with dolomites and alternation of thin to medium bedded platy shales. According to Conodont funa the following Conodozones are recognized: 1-? expansa-sulcata zone 2-duplicate zone 3-typicus zone 4-ancuralis-latus zone The upper part (Sradar Fm.) with 298m thickness consists of carbonate-terrigenous deposits including limestones, sandy limestones conglomerate and oolitic limestones with conodont funa. The following conodozones are recognized from this part: 1-muricatus zone 2-noduliferous zone 3-sinutus-minutus zone 4- sinusus-delicatus zone 5-?elongatus zone The section checked with regard to Conodont biostratigraphy and depositional environment. According to the above mentioned Conodozones, the Carboniferous deposits in Asadabad section dated from tournasian to Moscovion in age.The topmost of the section with the Vajnan Formation have parallel disconformity and the lower boundary is covered. The upper located among rocks of late Carboniferous is probably related to global variation of sea level due to glacial epoch (Late Carboniferous) in vast area of Gondwanan Supercontinent.

The studied section is located in Central Iran, 135 km southeast of Isfahan in Ramsheh area (latitude N 31o 46' 65", longitude E 52o 8' 63") GPS-WGS84 coordinates. The Ramsheh area structurally belongs to the Southwest-Central Iran and is checked regarding to microfacial and paleoinvironmental points of view as well as to biostratigraphical evidences. Carboniferous depositions (including Shishtu II sub Formation and Sardar Formation) are formed from limestones, dolomylimestones, shales, sandylimestone, sandstones and oolitich limestones. Based on detailed petrographical investigations and field studies, 15 mircofacies have been identified: 13 of them belong to carbonate microfacies that form in four sub-sedimentary environments, including Open marine, Barrier, Lagoon and Tidal flat and the other 2 microfacies show clastic material presence. The facies sequences observed in the carbonate platform sedimentation are the result of changes in environment through time and by natural processes operating within the environment or by fluctuations in the external factors controlling sedimentation such as tectonic activities and change in a sea-level. A characteristic of carbonate platform is its continuation without any breakage into the deepwater sedimentation.