The outcrop of Triassic sedimentary rocks in the west of Jolfa is 855 meters thick. These sedimentary units are composed of limestone with marl and shale interlayers, thin-layered to thick-layered dolomites and polymictic conglomerate. The upper border with the Miocene red conglomerate deposits of angular discontinuity, the lower border of this part of Elika Formation is adjacent to Alibashi Formation and its upper border is adjacent to Upper Elika. The lower part of Elika is mostly calcareous lithology which has dolomite and three intrusive masses, but the upper part of Elika is mostly dolomitic and in the inaccessible area. Petrographic evidence and elemental data indicate that this formation had an early aragonitic mineralogy. Plotting the changes in the ratio of major and minor elements shows that Elica limestones have been affected by biological burial diagenesis in a closed to semi-closed diagenetic system.