Stratigraphy, facies analysis and ammonite fauna of the Qal'eh Dokhtar Formation (Middle-Upper Jurassic) at the type locality west of Boshrouyeh (east-central Iran)

The three members of the more than 900 m thick Qal'eh Dokhtar Formation rep resent delta front, siliciclastic ramp, and carbonate platform slope enviro nments respectively. Sedimentation took place either in form of thickening- upward (shallowing) hemicycles or, in the case of the carbonate platform sl ope deposits, as thinning and fining-upward hemicycles recording cyclic cha nges in the accommodation space on the platform. Ammonites indicate a Middl e Callovian to Oxfordian age, but the base of the formation possibly reache d down to the lower Middle Jurassic. The consequences of these results for the correlation of Middle Jurassic strata of east-central Iran are briefly discussed.