Dabeigou Formation
Geologic formation in Hebei, China
From Wikipedia, the free encyclopedia
The Dabeigou Formation (simplified Chinese: 大北沟组; traditional Chinese: 大北溝組; pinyin: Dàběigōu zǔ) is a palaeontological formation located in Hebei, China.[1] It dates from the mid Valanginian to Hauterivian age of the Cretaceous period, approximately 135 to 130 Ma.[2]
| Dabeigou Formation | |
|---|---|
| Stratigraphic range: mid Valanginian-mid Hauterivian ~ | |
| Type | Geological formation |
| Unit of | Jehol Biota |
| Sub-units | Numbered Members |
| Underlies | Dadianzi & Yixian Formations |
| Overlies | Zhangjiakou Formation |
| Thickness | Varies, in Yushuxia section 220 metres (720 ft) |
| Lithology | |
| Primary | Sandstone, mudstone |
| Other | Tuffite, conglomerate, siltstone |
| Location | |
| Coordinates | 41.7°N 116.4°E |
| Approximate paleocoordinates | 43.6°N 118.5°E |
| Region | Hebei |
| Country | China |
  Dabeigou Formation (China)  Dabeigou Formation (Hebei) | |
Fossil content
Fossils include the confuciusornithiform bird Eoconfuciusornis.[3] As of 2016[citation needed] 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.
- Birds
- Amphibians
- Insects
- Amplicella beipiaoensis[6]
- A. exquisita[6]
- A. shcherbakovi[6]
- Brachyopteryx weichangensis[7]
- Chresmoda multinervis[8]
- C. shihi[8]
- Coptoclava longipoda[9]
- Glypta qingshilaensis[9]
- Hebeicoris xinboensis[7]
- Jibeigomphus xinboensis[7]
- Manlayamyia dabeigouensis[10]
- Mesasimulium laihaigouense[10]
- M. laiyangensis[10]
- Mesolygaeus hebeiensis[10]
- Mesoplecia xinboensis[7]
- Pleciofungivora yangtianense[7]
- Priscotendipes mirus[10]
- Vitimoilus ovatus[8]
- Notocupes lentus[9]
- Amplicella sp.[6]
- Ichneumonidae indet.[6]
- Tanychorinae indet.[6]