Tangbian Formation

Tangbian Formation
Stratigraphic range: Late Cretaceous, Campanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Guifeng Group
Underlies	Lianhe Formation
Overlies	Hekou Formation
Thickness	240–3,060 m (790–10,040 ft)
Lithology
Primary	purplish red sandstone, siltstone, and mudstone
Location
Coordinates	26°9′N 116°4′E
Region	Jiangxi Province
Country	China
Tangbian Formation (China)

The Tangbian Formation is a geological formation in Jiangxi Province, east China. While its absolute age is uncertain, it has been estimated to represent Late Cretaceous (Campanian) sediments. Dinosaur bones and eggs are among the fossils recovered from the formation.

Geology and paleoenvironment

The Tangbian Formation is known from outcrops in the Xinjiang Basin of Jiangxi Province, southeastern China. It is part of the Late Cretaceous Guifeng Group, underlain by the Hekou Formation and overlain by the Lianhe Formation in that group. The formation likely represents Campanian sediments, although absolute dates have not been obtained.^[1] The formation primarily comprises thick beds of fine-grained red-purple sandstone interbedded with mudstone, calcareous sandstone, and siltstone. The Tangbian Formation was deposited in an aeolian (wind-driven) setting representing a desert environment.^[2][3]

Fossil content

The Tangbian Formation contains a rich record of dinosaur egg fossils and embryos. Most of the known egg clutches can be associated with oviraptorosaurs, although rarer egg fossils are known from hadrosaurs, troodontids, and possibly dromaeosaurids.^[4][5]

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Genus	Species	Region	Material	Notes	Images
Huaxiazhoulong[6]	H. shouwen	Longxi Village, Guangchang County	Partial well-preserved skeleton	An ankylosaurid ankylosaur

Ootaxa

Genus	Species	Region	Material	Notes	Images
Minioolithus[4]	H. ganzhouensis	Meilin Village, Ganxian District	Clutch of six eggs	Classified as belonging to the Ovaloolithidae, likely laid by a theropod dinosaur

References

1. Xi, Dangpeng; Wan, Xiaoqiao; Li, Guobiao; Li, Gang (2019). "Cretaceous integrative stratigraphy and timescale of China". Science China Earth Sciences. 62 (1): 256–286. Bibcode:2019ScChD..62..256X. doi:10.1007/s11430-017-9262-y. ISSN 1674-7313.
2. Jiang, Xinsheng; Pan, Zhongxi; Xu, Jinsha; Li, Xiaoyong; Xie, Guogang; Xiao, Zhijian (2008). "Late Cretaceous aeolian dunes and reconstruction of palaeo-wind belts of the Xinjiang Basin, Jiangxi Province, China". Palaeogeography, Palaeoclimatology, Palaeoecology. 257 (1–2): 58–66. Bibcode:2008PPP...257...58J. doi:10.1016/j.palaeo.2007.09.012.
3. Zhang, Shouxin, ed. (2009), "Tangbian Formation (塘边组)", Geological Formation Names of China (1866–2000), Berlin, Heidelberg: Springer, p. 1075, doi:10.1007/978-3-540-93824-8_7612, ISBN 978-3-540-93824-8
4. Wu, Rui; Lou, Fasheng; Yu, Juan; Xue, Yu; Zhang, Shukang; Yang, Ling; Qiu, Wenjiang; Wang, Huimin; Han, Fenglu (2024-10-14). "The smallest known complete dinosaur fossil eggs from the Upper Cretaceous of South China". Historical Biology: 1–10. doi:10.1080/08912963.2024.2409873. ISSN 0891-2963.
5. Yu, Cheng-Tao; Fan, Xiu-Jun (2022). "赣州盆地梅林—茅店恐龙蛋化石产地分布及赋存地层特征" [Distribution of Dinosaur Egg Fossils and Occurrence Stratigraphic Characteristics of Meilin—Maodian,Ganzhou Basin]. Journal of Hebei GEO University (in Chinese). 45 (4): 6–12.
6. Zhu, Ziheng; Wu, Jie; You, Yue; Jia, Yingli; Chen, Chujiao; Yao, Xi; Zheng, Wenjie; Xu, Xing (2024-11-08). "A new ankylosaurid dinosaur from the Upper Cretaceous of Jiangxi Province, southern China". Historical Biology: 1–17. doi:10.1080/08912963.2024.2417208. ISSN 0891-2963.