A relatively complete conodont record from Famennian to the Mississippian/Pennsylvanian boundary was investigated in the Anarak section, Central Iran. The studied interval belongs to the Bahram, Shishtu, Ghaleh and Absheni formations. The Famennian part of the section (Bahram Formation) ranges from the Palmatolepis triangularis Zone into the Bispathodus ultimus Zone. Not all conodont zones could be defined due to the lack of indicative species. Furthermore, it seems likely that a hiatus occurs around the Devonian/Carboniferous (D/C) boundary (most probably from the Siphonodella praesulcata to the ?Siphonodella sulcata–early Siphonodella crenulata conodont zones) based on the lack of stratigraphically important conodonts as well as on sedimentological criteria. The lack of representative siphonodellids and protognathodids at the base of the Mississippian prevents detailed stratigraphic position of the D/C boundary. Lower Carboniferous (Mississippian) rocks are characterized by red nodular limestone which is unique in comparison with other studied sections of the same age in Central Iran. Within the studied section, we could define the Mississippian/Pennsylvanian boundary. The mid-Carboniferous boundary was defined by the occurrence of Declinognathus noduliferus s.l. Conodont biofacies changes (Mississippian genera Gnathodus and Lochriea have been replaced by Pennsylvanian genera Declinognathus and Idiognathodus) are recognized in this section as well.

在伊朗中部的阿纳拉克剖面调查了从法门尼人到密西西比/宾夕法尼亚州边界的一个相对完整的牙形石记录。研究的区间属于巴赫拉姆，希什图，加勒赫和阿布谢尼地层。该断面的法门尼部分（巴赫拉姆组）的范围从帕尔马图里斯三角洲带到最后的比斯帕多特斯带。由于缺乏指示性物种，并非所有的牙形质区都可以定义。此外，似乎在泥盆纪/石炭纪（D / C）边界周围发生了裂隙（最有可能是从普拉氏短吻鳄到苏丹短吻鳄–早熟鸢尾。缺乏牙形学上重要的牙形石以及沉积学标准。密西西比河底部缺乏典型的虹吸虫和原鞭毛虫，这使得D / C边界的详细地层位置无法实现。低石炭纪（密西西比）岩石的特征是红色节状石灰岩，与伊朗中部其他相同年龄的研究断面相比，它是独特的。在研究区域内，我们可以定义密西西比/宾夕法尼亚州边界。中石炭纪界线是由Declinognathus noduliferus sl牙形生物相变化的发生所定义的（密西西比属Gnathodus和Lochriea已被宾夕法尼亚州属取代）Declinognathus和Idiognathodus）本条是公认的好。