The Sunjiawan Formation () is a geological formation in Liaoning, China, with strata possibly dating back to the early Late Cretaceous, specifically the Cenomanian. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al., 2004, pp.563-570 It forms part of the same geological sequence as the older and underlying Yixian Formation and Jiufotang Formation. It primarily consists of variegated conglomerates with rare intercalations of thin bedded sandstones, siltstones and mudstones.
Fossil content Remains of the following dinosaurs have been found in the formation:
Dinosaurs
Ankylosaurs Ankylosaurs of the Sunjiawan Formation Genus Species Location Stratigraphic position Material Notes Images Crichtonpelta C. benxiensis A partial skeleton. A ankylosaurine ankylosaurid CrichtonsaurusC. bohlini A partial skeleton. A ankylosaurine ankylosaurid
Ornithopods Ornithopods of the Sunjiawan Formation Genus Species Location Stratigraphic position Material Notes Images Hadrosauroidea Indet. Indeterminate Dental remainsDifferent with Shuangmiaosaurus from the same stratigraphic unit Shuangmiaosaurus S. gilmorei A partial left upper jaw and lower jaw. A styracosternan ornithopod
Sauropods Sauropods of the Sunjiawan Formation Genus Species Location Stratigraphic position Material Notes Images Borealosaurus B. wimani Two caudal vertebra, humerus and isolated tooth crown A titanosaurian sauropod Titanosauriformes Indet. Indeterminate Single tooth Provisionally attributed to Borealosaurus
Theropods Theropods of the Sunjiawan Formation Genus Species Location Stratigraphic position Material Notes Images Tyrannosauroidea Indet. Indeterminate Single tooth
See also List of dinosaur-bearing rock formations Zhumapu Formation
References