They are Liangshan stage of Early Permian series, Longtan stage of late Permian series and Xiangxi stage of Early Jurassic-Late Triassic series.

• 湖北省主要发育有三套煤系，即下二叠统梁山煤系、上二叠统龙潭煤系、上三叠-下侏罗统香溪煤系。