Sunjiawan Formation

The Sunjiawan Formation (simplified Chinese: 孙家湾组; traditional Chinese: 孫家灣組; pinyin: Sūnjiāwān Zǔ) is a geological formation in Liaoning, China, with strata possibly dating back to the early Late Cretaceous, specifically the Cenomanian.^[1] Dinosaur remains are among the fossils that have been recovered from the formation.^[2] 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.^[3]

Sunjiawan Formation
Stratigraphic range: Early Cenomanian ~99–95 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Overlies	Unconformity with Fuxin Formation
Lithology
Primary	Conglomerate
Other	Sandstone, siltstone, mudstone
Location
Coordinates	41.7°N 120.8°E / 41.7; 120.8
Approximate paleocoordinates	46.2°N 112.1°E / 46.2; 112.1
Region	Liaoning
Country	China
Extent	Beipiao Basin
Sunjiawan Formation (China) Show map of China Sunjiawan Formation (Liaoning) Show map of Liaoning

Dinosaurs

Remains of the following dinosaurs have been found in the formation:

Ornithischians

Remains of the following dinosaurs have been found in the formation:

Dinosaurs reported from the Sunjiawan Formation
Genus	Species	Material	Notes	Images
Crichtonpelta	C. benxiensis	a partial skeleton
Crichtonsaurus	C. bohlini	a partial skeleton
Shuangmiaosaurus	S. gilmorei	a partial left upper jaw and lower jaw,

Saurischians

Remains of the following dinosaurs have been found in the formation:

Dinosaurs reported from the Sunjiawan Formation
Genus	Species	Material	Notes	Images

See also

• List of dinosaur-bearing rock formations
• Zhumapu Formation