Dabeigou Formation
Stratigraphic range: mid Valanginian-mid Hauterivian
~135–130 Ma
↓
TypeGeological formation
Unit ofJehol Biota
Sub-unitsNumbered Members
UnderliesDadianzi & Yixian Formations
OverliesZhangjiakou Formation
ThicknessVaries, in Yushuxia section 220 metres (720 ft)
Lithology
PrimarySandstone, mudstone
OtherTuffite, conglomerate, siltstone
Location
Coordinates41°42′N 116°24′E / 41.7°N 116.4°E / 41.7; 116.4
Approximate paleocoordinates43°36′N 118°30′E / 43.6°N 118.5°E / 43.6; 118.5
RegionHebei
Country China
Dabeigou Formation is located in China
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation (China)
Dabeigou Formation is located in Hebei
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation
Dabeigou Formation (Hebei)

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]

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

See also

References

  1. ^ Dabeigou Formation at Fossilworks.org
  2. ^ Qin et al., 2018
  3. ^ Zhang et al., 2008
  4. ^ Wang & Stidham, 2018
  5. ^ Rong, 2018
  6. ^ a b c d e f Kopylov & Zhang, 2015
  7. ^ a b c d e Hong, 1984
  8. ^ a b c Zhang et al., 2009
  9. ^ a b c Ren, 1995
  10. ^ a b c d e Zhang, 1986

Bibliography

Further reading

Categories