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The Permian and Triassic beds deposited in the Zagros Basin form a massive carbonate and evaporite sequence in excess of 2000m. These strata were divided into clearly recognizable and mappable lithostratigraphic units and major lithofacies types using surface exposures, subsurface log information and sample cuttings . Formation and member designations are given to distinct and widespread lithostratigraphic units and where possible, the boundaries of these units are selected to coincide with sedimentary gaps or boundaries of sedimentary cycles . A well type‐section and a surface reference section are established to illustrate the distribution of these units both vertically and horizontally . Major unconformities were observed and documented at the base of the Permian and at the top of the Triassic, a smaller break was noted between the Triassic and Permian sediments . Revision of the Jurassic‐Triassic boundary is made, based on this new stratigraphic evidence .
Szabo et al. (Sun,) studied this question.