The Hekou Group is a geological group in Gansu Province, China. It is Early Cretaceous in age. Many dinosaur fossils have been recovered from the Hekou Group, including iguanodonts, large sauropods, and Thyreophora. are rare, but one oogenus, Polyclonoolithus, was discovered in the Hekou Group.Xie, J.-F., Zhang, S.-K., Jin, X.-S., Li, D.-Q., and Zhou, L.-Q. (2016) " A new type of dinosaur eggs from Early Cretaceous of Gansu Province, China. " Vertebrata PalAsiatica, 54(1):1-10. Extensive Trace fossil belonging to pterosaur and dinosaurs have also been described.Lockley, M.; Harris, J.D.; and Mitchell, L. 2008. "A global overview of pterosaur ichnology: tracksite distribution in space and time." Zitteliana. B28. p. 187-198. . The group spans the Valanginian to Albian and can be subdivided into four formations.
Lanzhousaurus | L. magnidens | A partial skeleton including the mandible, maxillary teeth, dentary teeth, cervical and dorsal vertebrae, sternal plates, ribs, and pubes | A large Ankylopollexia Ornithopoda | |||
Daxiatitan | D. binglingi | A partial skeleton including cervical, dorsal, and caudal vertebrae, ribs, and a Haemal arch, scapulocoracoid, and femur | A Titanosauria Sauropoda | |||
Huanghetitan | H. liujiaxiaensis | A partial skeleton including caudal vertebrae, a partial sacrum and ribs, and the left shoulder girdle | A Somphospondyli sauropod | |||
Yongjinglong | Y. datangi | A partial skeleton including teeth, cervical and dorsal vertebrae, a rib, the left scapulocoracoid, and the right ulna and radius | A Euhelopodidae somphospondylian | |||
Stegosaurinae | Indeterminate | A partial skeleton including cervical and dorsal vertebrae, ribs, a right forelimb (including a partial humerus, ulna, and radius), and one dermal plate | An unnamed stegosaurid distinct from Wuerhosaurus and Stegosaurus stenops. | |||
Taohelong | T. jinchengensis | A partial skeleton including ribs, a left ilium, a caudal vertebra, and part of the sacral shield | A Polacanthinae Nodosauridae | |||
Sinamia | S. lanshoensis | Many well-preserved specimens as part and counterpart fossils | A Sinamiidae Amiiformes | |||
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