Dabeigou Formation

Dabeigou Formation
Stratigraphic range:
Mid Valanginian to mid Hauterivian
~135–130 Ma
↓
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

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]

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

References

  1. ↑ Qin, Zuohuan; Xi, Dangpeng; Sames, Benjamin; Do Carmo, Dermeval Aparecido; Wang, Xuri; Xu, Yankang; Yu, Zhiqiang; Wei, Feng; Leite, Amanda Moreira (2018-06). "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. Check date values in: |date= (help)
  • Vickers-Rich, Patricia & Rich, Thomas Hewett (1993); Wildlife of Gondwana. Reed. ISBN 0-7301-0315-3


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