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