Dabeigou Formation

The Dabeigou Formation is a palaeontological formation located in China. It dates from the mid Valanginian to Hauterivian age of the Cretaceous period. Approximately 135-130 ma.[1]

Dabeigou Formation Stratigraphic range: Mid Valanginian to mid Hauterivian ~135–130 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Jehol Biota
Sub-units	Numbered Members
Underlies	Dadianzi Formation, Yixian Formation
Overlies	Zhangjiakou Formation
Thickness	Varies, in Yushuxia section 220 metres (720 ft)
Lithology
Primary	Sandstone, Mudstone
Other	Tuffite, Conglomerate, Siltstone
Location
Region	Asia
Country	China

Fossils include the confuciusornithiform bird Eoconfuciusornis. As of 2016 this is the oldest bird with a toothless beak known, but it belongs to a very ancestral avian lineage not closely related to living birds.

See also

• List of fossil sites

References

1. Qin, Zuohuan; Xi, Dangpeng; Sames, Benjamin; Do Carmo, Dermeval Aparecido; Wang, Xuri; Xu, Yankang; Yu, Zhiqiang; Wei, Feng; Leite, Amanda Moreira (June 2018). "Ostracods of the non-marine Lower Cretaceous Dabeigou Formation at Yushuxia (Luanping basin, North China): Implications for the early Jehol Biota age". Cretaceous Research. 86: 199–218. doi:10.1016/j.cretres.2018.03.010. ISSN 0195-6671.

Further reading

• Vickers-Rich, Patricia & Rich, Thomas Hewett (1993); Wildlife of Gondwana. Reed. ISBN 0-7301-0315-3