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

References

1. Xi et al., 2018
2. Weishampel et al., 2004, pp.563-570
3. Wang et al., 2015

Bibliography

• Xi, D.; Wan, X.; Li, G.; Li, G. (2018), "Cretaceous integrative stratigraphy and timescale of China", Science China Earth Sciences, 61: 1–31, doi:10.1007/s11430-017-9262-y
• Wang, Yaqiong; Sha, Jingeng; Pan, Yanhong; Zhang, Xiaolin (2015), "Early Cretaceous nonmarine ostracod biostratigraphy ofwestern Liaoning area, NE China", Micropaleontology, 61 (1): 135–145, Bibcode:2015MiPal..61..135W, doi:10.47894/mpal.61.1.10, retrieved 2020-06-04
• Lu, J.; Ji, Q.; Gao, Y.; Li, Z. (2007), "A New Species of the Ankylosaurid Dinosaur Crichtonsaurus (Ankylosauridae: Ankylosauria) from the Cretaceous of Liaoning Province, China", Acta Geologica Sinica, 81 (6): 883–897, doi:10.1111/j.1755-6724.2004.tb00212.x, retrieved 2020-06-04
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
• You, H.; Ji, Q.; Lamanna, M.C.; Li, J.; Li, Y. (2004), "A Titanosaurian Sauropod Dinosaur with Opisthocoelous Caudal Vertebrae from the Early Late Cretaceous of Liaoning Province, China", Acta Geologica Sinica, 78 (4): 907–911, doi:10.1111/j.1755-6724.2007.tb01010.x, retrieved 2020-06-04

Further reading

• H. You, Q. Ji, J. Li and Y. Li. 2003. A new hadrosauroid dinosaur from the mid-Cretaceous of Liaoning, China. Acta Geologica Sinica 77(2):148-154
• Z.-M. Dong. 2002. A new armored dinosaur (Ankylosauria) from Beipiao Basin, Liaoning Province, northeastern China. Vertebrata PalAsiatica 40(4):276-285