Hekou Group

The Hekou Group is a geological group in Gansu Province, China. It is Early Cretaceous in age. Dinosaur body fossils have also been recovered from the Hekou Group, including the iguanodont Lanzhousaurus and the titanosaurs Daxiatitan, Huanghetitan and Yongjinglong, and the nodosaur Taohelong. Fossil eggs are rare, but one oogenus, Polyclonoolithus, was discovered in the Hekou Group.[2] The group spans the Valanginian to Albian and can be subdivided into four formations.[1] Fossil pterosaur tracks have been recovered.

Hekou Group Stratigraphic range: Early Cretaceous,[1] Valanginian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geologic group
Sub-units	Huazhuang Formation, Hongkoucheng Formation, Yanguoxia Formation, Zhujiatai Formation
Underlies	Unconformity: Minhe Formation
Overlies	Unconformity: Xiangtang Formation
Thickness	3,700 m (12,100 ft)
Lithology
Primary	Sandstone, mudstone, conglomerate
Location
Coordinates	35.9°N 103.3°E
Approximate paleocoordinates	34.8°N 103.1°E
Region	Gansu
Country	China
Extent	Longzhong Basin
Hekou Group (China) Hekou Group (Gansu)

Vertebrate paleofauna

Pterosaurs

Pterosaurs
Taxa	Presence	Description	Images
Ichnogenus: Pteraichnus[3]	Found near Yanguoxia, Gansu Province.[3]	Specimens housed at the Dinosaur Tracks Museum, of the University of Colorado at Denver.[3]

References

1. Xi, D.; Wan, X.; Li, G.; Li, G. (2018). "Cretaceous integrative stratigraphy and timescale of China". Science China Earth Sciences. 61: 1–31. doi:10.1007/s11430-017-9262-y.
2. Xie, J.-F., Zhang, S.-K., Jin, X.-S., Li, D.-Q., and Zhou, L.-Q. (2016) "A new type of dinosaur eggs from Early Cretaceous of Gansu Province, China. Archived 2016-01-29 at the Wayback Machine" Vertebrata PalAsiatica, 54(1):1-10.
3. Lockley, M.; Harris, J.D.; and Mitchell, L. 2008. "A global overview of pterosaur ichnology: tracksite distribution in space and time." Zitteliana. B28. p. 187-198. ISSN 1612-4138.

See also

• List of fossil sites
• List of dinosaur bearing rock formations