Huajiying Formation
Stratigraphic range: Valanginian-Aptian
TypeGeological formation
Unit ofJehol Group
Sub-unitsGuohedao Member,
Nianzigou Member,
Qiaotou Member,
Sichakou Member
UnderliesQuingshila Formation
OverliesDabeigou Formation
Location
RegionHebei
Country China

The Huajiying Formation is a geological formation in Hebei, People's Republic of China. Known for its fossils including feathered dinosaurs, the age of the formation is uncertain. It may represent an early portion of the Jehol Biota, dating to somewhere in the early Cretaceous or late Jurassic periods. It may correlate with the early Cretaceous Dadianzi Formation and parts of the Yixian Formation, with an age range between 140 and 122 Ma ago.[1] It contains the Qiaotou Member, sometimes treated as a distinct formation.

Age and stratigraphy

The Huajiying Formation contains the following members, in order from youngest to oldest:

The age of the formation is uncertain. Ji and colleagues suggested in 2008 that the Qiaotou Member correlates with the Dawangzhangzi bed of the Yixian Formation, dated to ~122 Ma ago by Zhou in 2006.[2] Ji et al. also suggested that the lower Sichakou Member correlates with the Dadianzi Formation, dated to 140 Ma ago by Tian and colleagues in 2003.[3]

Paleobiota

The faunal lists below are based on a survey of the Huajiying Formation by Jin Fan and colleagues in 2008, unless otherwise noted.[4]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Theropods

Genus Species County Member Abundance Notes Images
Archaeornithura A. meemannae Fengning Sichakou Member An ornithuromorph
Archaeornithura
Cruralispennia C. multidonta Sichakou Member An enantiornithine
Cruralispennia
Eopengornis E. martini An enantiornithine

"Hebeiornis"

"H. fengningensis"

Qiaotou Member

Nomen nudum/objective junior synonym of Vescornis

Jibeinia

J. luanhera

Qiaotou Member

An enantiornithine

Jinfengopteryx

J. elegans

Qiaotou Member

A troodontid
Jinfengopteryx

Protopteryx

P. fengningensis

Sichakou Member

An enantiornithine

Shenqiornis[1]

S. mengi

Qiaotou Member

An enantiornithine

Vescornis

V. hebeiensis

Qiaotou Member

An enantiornithine
Xunmenglong X. yinlianglis A compsognathid

Pterosaurs

Genus Species County Member Abundance Notes Images
Cratonopterus[5] C. huabei Fengning A ctenochasmatid
Ornithocheiroidea[6] Indeterminate Fengning Partial skeleton of an indeterminate ornithocheiroid

Fishes

Genus Species County Member Abundance Notes Images

Lycoptera

L. davidi

Also present in the Jiufotang Formation & Yixian Formation

An osteoglossomorph

Lycoptera davidi
Yanosteus longidorsalis

L. tokunagai

Peipiaosteus

P. fengningensis

A fish related to sturgeons

Protopsephurus

P. liui

Also present in the Jiufotang & Yixian Formations

A paddlefish

Yanosteus

Y. longidorsalis

Also present in the Yixian Formation

A peipiaosteid

Invertebrates

Genus Species County Member Abundance Notes Images
Yanjiestheria Y. huajiyingensis Well-preserved remains and eggs.[7] A spinicaudatan

References

  1. ^ a b Wang, X., O’Connor, J.K., Zhao, B., Chiappe, L.M., Gao, C. and Cheng, X. (2010). "New species of Enantiornithes (Aves: Ornithothoraces) from the Qiaotou Formation in Northern Hebei, China." Acta Geologica Sinica, 84(2): 247-256.
  2. ^ Zhou, Z. (2006). "Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives." Geological Journal, 41: 377–393.
  3. ^ Tian, S.G., Liu, Y.Q., Li, P.X., Pang, Q. and Niu, S. (2003). "Sequence stratigraphy of Jurassic-Cretaceous boundary strata in Luanping, Northern Hebei, China." Science in China Series D: Earth Sciences, 47(7): 607―617.
  4. ^ Jin, F., Zhang, F.C., Li, Z.H., Zhang, J.Y., Li, C. and Zhou, Z.H. (2008). "On the horizon of Protopteryx and the early vertebrate fossil assemblages of the Jehol Biota." Chinese Science Bulletin, 53(18): 2820-2827.
  5. ^ Jiang, Shunxing; Song, Junyi; Zhang, Xinjun; Cheng, Xin; Wang, Xiaolin (2023-11-15). "A new pterosaur from the early stage of the Jehol biota in China, with a study on the relative thickness of bone walls". Heliyon. E22370. doi:10.1016/j.heliyon.2023.e22370. PMC 10709016.
  6. ^ Zhou, Chang-Fu; Zhu, Ziheng; Chen, Jianye (2022-05-22). "First pterosaur from the Early Cretaceous Huajiying Formation of the Jehol Biota, northern Hebei Province, China: insights on the pedal diversity of Pterodactyloidea". Historical Biology. 35 (7): 1129–1135. doi:10.1080/08912963.2022.2079085. ISSN 0891-2963.
  7. ^ Li, Gang (2022-11-25). "New spinicaudatan species (Crustacea) of the Lower Cretaceous (Valanginian–Hauterivian) Jehol Biota from northern Hebei, China". Cretaceous Research. 143: 105425. doi:10.1016/j.cretres.2022.105425. ISSN 0195-6671. S2CID 253998860.
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