Xintiangou Formation
Geological formation in Sichuan, China
The Xintiangou Formation is a geological formation in China . Part of the stratigraphy of the Sichuan Basin , it is of an uncertain Middle Jurassic age, with preliminary U-Pb estimates giving an age range of 170 ma. It predominantly consists of interbedded mudstone and sandstone, with subordinate shelly limestone. At the Laojun site remains of lungfish , bony fish , freshwater sharks, temnospondyls , plesiosaurs ,[ 1] [ 2] crocodyliformes , the Xinjiangchelyid turtle Protoxinjiangchelys and tritylodontids are known.[ 3] The dinosaurs Sanxiasaurus , Yunyangosaurus , and indeterminate sauropods are also known from the formation.[ 4] [ 5] Theropod and ornithopod tracks have also been reported from the formation.[ 6] [ 7]
References
^ Zhang, Feng; Yu, Hai-Dong; Xiong, Can; Wei, Zhao-Ying; Peng, Guang-Zhao; Wei, Xue-Fang (December 2020). "New freshwater plesiosaurian materials from the Middle Jurassic Xintiangou Formation of the Sichuan Basin, southwestern China" . Journal of Palaeogeography . 9 (1): 23. doi :10.1186/s42501-020-00072-y . ISSN 2524-4507 .
^ Ma, Qingyu; Li, Ning; Lin, Yu; Xiong, Can; Wei, Xuefang (2023-10-11). "Isolated freshwater pliosaurid teeth from the Middle Jurassic Xintiangou Formation of Chongqing, China" . Historical Biology : 1–10. doi :10.1080/08912963.2023.2268617 . ISSN 0891-2963 . S2CID 264056915 .
^ Hu, Xufeng; Li, Lu; Dai, Hui; Wang, Ping; Buffetaut, Eric; Wei, Guangbiao; Xiong, Can; Tong, Haiyan (August 2020). "Turtle remains from the Middle Jurassic Xintiangou Formation of Yunyang, Sichuan Basin, China" . Annales de Paléontologie . 106 (4): 102440. doi :10.1016/j.annpal.2020.102440 . S2CID 225451666 .
^ Li, Ning; Dai, Hui; Tan, Chao; Hu, Xufeng; Wei, Zhaoying; Lin, Yu; Wei, Guangbiao; Li, Deliang; Meng, Li; Hao, Baoqiao; You, Hailu (2019-10-31). "A neornithischian dinosaur from the Middle Jurassic Xintiangou Formation of Yunyang, Chongqing, China: the earliest record in Asia". Historical Biology . 33 (7): 1089–1102. doi :10.1080/08912963.2019.1679129 . ISSN 0891-2963 . S2CID 209583081 .
^ Hui Dai; Roger Benson; Xufeng Hu; Qingyu Ma; Chao Tan; Ning Li; Ming Xiao; Haiqian Hu; Yuxuan Zhou; Zhaoying Wei; Feng Zhang; Shan Jiang; Deliang Li; Guangzhao Peng; Yilun Yu; Xing Xu (2020). "A new possible megalosauroid theropod from the Middle Jurassic Xintiangou Formation of Chongqing, People's Republic of China and its implication for early tetanuran evolution" . Scientific Reports . 10 (1): Article number 139. doi :10.1038/s41598-019-56959-x . PMC 6954265 . PMID 31924836 .
^ Xing, Lida; Peng, Guangzhao; Ye, Yong; Lockley, Martin G.; Klein, Hendrik; Persons, W. Scott; Zhang, Jianping; Shu, Chunkang; Hao, Baoqiao (2014-04-03). "Sauropod and Small Theropod Tracks from the Lower Jurassic Ziliujing Formation of Zigong City, Sichuan, China, with an Overview of Triassic–Jurassic Dinosaur Fossils and Footprints of the Sichuan Basin". Ichnos . 21 (2): 119–130. CiteSeerX 10.1.1.663.3037 . doi :10.1080/10420940.2014.909352 . ISSN 1042-0940 . S2CID 129220218 .
^ Xing, Lida; Lockley, Martin G.; Wang, Yongdong; Pole, Mike S.; Klein, Hendrik; Peng, Guangzhao; Xie, Xiaoping; Zhang, Guoquan; Deng, Chuntao; Burns, Michael E. (August 2017). "New Middle Jurassic dinosaur track record from northeastern Sichuan Province, China" . Swiss Journal of Palaeontology . 136 (2): 359–364. doi :10.1007/s13358-016-0123-4 . ISSN 1664-2376 . S2CID 132256539 .