Formation de Tiaojishan
Doahuqou Formation
Tiaojishan-formatie
Formação de Tiaojishan
Tiaojishan Formation
Oxfordian
formation géologique
geological formation in China
Exposure of the Tiaojishan Formation at Nanshimenzi Village, Qinglong Manchu Autonomous County, Hebei Province, with red arrow pointing to fossiliferous beds