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 | |
|---|---|
| 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 |  |
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
- 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
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