Dabeigou Formation

Dabeigou Formation
Stratigraphic range: mid Valanginian-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 & 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°42′N 116°24′E / 41.7°N 116.4°E / 41.7; 116.4
Approximate paleocoordinates	43°36′N 118°30′E / 43.6°N 118.5°E / 43.6; 118.5
Region	Hebei
Country	China
Dabeigou Formation (China) Show map of China Dabeigou Formation (Hebei) Show map of 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]

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

• Jinguofortis perplexus^[4]

Amphibians

• Regalerpeton weichangensis^[5]

Insects

• List of fossil sites

• Qin, Zuohuan; Xi, Dangpeng; Sames, Benjamin; Do Carmo, Dermeval Aparecido; Wang, Xuri; Xu, Yankang; Yu, Zhiqiang; Wei, Feng; Leite, Amanda Moreira (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, Bibcode:2018CrRes..86..199Q, doi:10.1016/j.cretres.2018.03.010, ISSN 0195-6671
• Rong, Y.-F (2018), "Restudy of Regalerpeton weichangensis (Amphibia: Urodela) from the Lower Cretaceous of Hebei, China", Vertebrata PalAsiatica, 56: 121–136
• Wang, M.; Stidham, T. A. (2018), "A new clade of basal Early Cretaceous pygostylian birds and developmental plasticity of the avian shoulder girdle", Proceedings of the National Academy of Sciences, 115 (42): 10708–10713, Bibcode:2018PNAS..11510708W, doi:10.1073/pnas.1812176115, PMC 6196491, PMID 30249638
• Kopylov, D. S.; Zhang, H. C. (2015), "New ichneumonids (Insecta: Hymenoptera: Ichneumonidae) from the Lower Cretaceous of north China", Cretaceous Research, 52: 591–604, Bibcode:2015CrRes..52..591K, doi:10.1016/j.cretres.2014.03.012
• Zhang, X. W.; Ren, D.; Pang, H.; Shih, C.K. (2009), "Late Mesozoic chresmodids with forewing from Inner Mongolia, China (Polyneoptera: Archaeorthoptera)", Acta Geologica Sinica, 84: 38–46, doi:10.1111/j.1755-6724.2010.00168.x
• Zhang, Z.; Zhou, Z.; Benton, M. J. (2008), "A primitive confuciusornithid bird from China and its implications for early avian flight", Science in China Series D: Earth Sciences, 51 (5): 625–639, Bibcode:2008ScChD..51..625Z, doi:10.1007/s11430-008-0050-3
• Ren, D (1995), Insecta, D. Ren, L.W. Lu, Z.G. Guo, S.A. Ji (eds.), Faunae and stratigraphy of Jurassic-Cretaceous in Beijing and the adjacent areas, pp. 47–121
• Zhang, J. F (1986), Some fossil insects from the Jurassic of northern Hebei, China, The Paleontology and Stratigraphy of Shandong, pp. 74–84
• Hong, Y. C (1984), Insecta, Palaeontological Atlas of North China, II, Mesozoic Volume, pp. 128–185

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