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

Vertebrate paleofauna

• Borealosaurus wilmani - Caudal vertebrae, humerus, teeth.[4]
• Crichtonpelta benxiensis - Nearly complete skull and incomplete skeleton.[5]
• "Crichtonsaurus bohlini"[2] - "Partial skeleton."[6]
• Shuangmiaosaurus[2] - "Partial skull."[7]

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
4. You et al., 2004
5. Lu et al., 2007
6. "Table 17.1," in Weishampel et al., 2004, p.366
7. "Table 19.1," in Weishampel et al., 2004, p.417

Bibliography

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

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