Riahi, nassim, , , Adabi, Mohammad Hossein, ,  (2021). Biostratigraphy of the Tirgan Formation in Robat-Eshgh (south-west of Bojnurd) and Ghezelghan (North of Bojnurd) stratigraphic sections, and comparing them with each other.. *Iranian Journal of Geology*, 15(57), 123-141.