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 ~ | |
| Type | Geological formation |
| Overlies | Unconformity with Fuxin Formation |
| Lithology | |
| Primary | Conglomerate |
| Other | Sandstone, siltstone, mudstone |
| Location | |
| Coordinates | 41°42′N 120°48′E / 41.7°N 120.8°E |
| Approximate paleocoordinates | 46°12′N 112°06′E / 46.2°N 112.1°E |
| Region | Liaoning |
| Country |  China |
| Extent | Beipiao Basin |
  Sunjiawan Formation (China)  Sunjiawan Formation (Liaoning) | |
Dinosaurs edit
Remains of the following dinosaurs have been found in the formation:
Ornithischians edit
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, | ||
See also edit
References edit
Bibliography edit
- 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(1). 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(6). 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(4). 907–911. Accessed 2020-06-04. doi:10.1111/j.1755-6724.2007.tb01010.x
Further reading edit
- 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