Earth:Sunjiawan Formation
From HandWiki
| Sunjiawan Formation Stratigraphic range: Early Cenomanian ~99–95 Ma | |
|---|---|
| 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 |
| 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) | |
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]
Fossil content
Remains of the following dinosaurs have been found in the formation:
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Dinosaurs
Ankylosaurs
| Ankylosaurs of the Sunjiawan Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Crichtonpelta[4] | C. benxiensis[5] | A partial skeleton. | A ankylosaurine ankylosaurid | |||
| Crichtonsaurus[6] | C. 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 remains[7] | Different with Shuangmiaosaurus from the same stratigraphic unit | |||
| Shuangmiaosaurus[8] | 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[9] | B. wimani | Two caudal vertebra, humerus and isolated tooth crown | A titanosaurian sauropod | |||
| Titanosauriformes Indet. | Indeterminate | Single tooth[7] | Provisionally attributed to Borealosaurus | |||
Theropods
| Theropods of the Sunjiawan Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Tyrannosauroidea Indet. | Indeterminate | Single tooth[7] | ||||
See also
- List of dinosaur-bearing rock formations
- Zhumapu Formation
References
- ↑ Xi, Dangpeng; Wan, Xiaoqiao; Li, Guobiao; Li, Gang (January 2019). "Cretaceous integrative stratigraphy and timescale of China". Science China Earth Sciences 62 (1): 256–286. doi:10.1007/s11430-017-9262-y.
- ↑ Weishampel et al., 2004, pp.563-570
- ↑ Wang, Yaquiong; Sha, Jingeng; Pan, Yanhong; Zhang, Xiaolin (2015). "Early Cretaceous nonmarine ostracod biostratigraphy of western Liaoning area, NE China". Micropaleontology 61 (1-2): 135–145. doi:10.47894/mpal.61.1.10.
- ↑ Victoria M. Arbour; Philip J. Currie (2015). "Systematics, phylogeny and palaeobiogeography of the ankylosaurid dinosaurs". Journal of Systematic Palaeontology 14 (5): 385–444. doi:10.1080/14772019.2015.1059985.
- ↑ Junchang, Lü; Qiang, Ji; Yubo, Gao; Zhixin, Li (December 2007). "A New Species of the Ankylosaurid Dinosaur Crichtonsaurus (Ankylosauridae: Ankylosauria) from the Cretaceous of Liaoning Province, China". Acta Geologica Sinica - English Edition 81 (6): 883–897. doi:10.1111/j.1755-6724.2007.tb01010.x.
- ↑ Dong, Zhi-Ming (2002). "A new armored dinosaur (Ankylosauria) from Beipiao Basin, Liaoning Province, northeastern China". Vertebrata Palasiatica 40 (4): 276-285. https://www.vertpala.ac.cn/EN/Y2002/V40/I04/276.
- ↑ 7.0 7.1 7.2 Yin, Ya-Lei; Xie, Fei; Zhou, Chang-Fu; Pei, Rui (3 March 2024). "Dinosaur teeth from the mid-Cretaceous Sunjiawan Formation of western Liaoning Province, China". Historical Biology 36 (3): 631–637. doi:10.1080/08912963.2023.2179398.
- ↑ Hailu, You; Qiang, Ji; Jinglu, Li; Yinxian, Li (June 2003). "A New Hadrosauroid Dinosaur from the Mid‐Cretaceous of Liaoning, China". Acta Geologica Sinica - English Edition 77 (2): 148–154. doi:10.1111/j.1755-6724.2003.tb00557.x.
- ↑ Hailu, You; Qiang, Ji; Lamanna, Matthew C.; Jinglu, Li; Yinxian, Li (August 2004). "A Titanosaurian Sauropod Dinosaur with Opisthocoelous Caudal Vertebrae from the Early Late Cretaceous of Liaoning Province, China". Acta Geologica Sinica - English Edition 78 (4): 907–911. doi:10.1111/j.1755-6724.2004.tb00212.x.
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