The Gengjiajie Formation is in the upper part of the Eogene in the Fushun coal field. The formal nomenclature of the formation firstly appeared in the literature in 1978. The primary section of the formation is unfossiliferous.

• 耿家街组是抚顺煤田下第三系最上部地层，这一组名正式见诸文献为1978年。