Yuanjiawa, Dapingfang: Aptian, China
collected by numerous 2004-2015

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Dromaeosauridae
Microraptor sp. Xu et al. 2000
Zhou 2010
Reptilia - Confuciusornithiformes - Confuciusornithidae
Confuciusornis sp. Hou et al. 1995
Zhou 2010
Reptilia - Longipterygidae
Longipteryx chaoyangensis Zhang et al. 2000
Wang et al. 2015 1 individual
DNHM-D2889
Reptilia
Yuanjiawaornis viriosus n. gen., n. sp. Hu et al. 2015
Hu et al. 2015 1 individual
PMOL AB00032, nearly complete and mostly articulated postcranial skeleton, missing the skull, cervical and cranial thoracic vertebrae, and most of the manual and pedal digits
Reptilia - Cathayornithiformes - Alethoalaornithidae
Alethoalaornis agitornis n. gen., n. sp. Li et al. 2007
Li et al. 2007 5 individuals
LPM 00009, 00032, 00038, 00040, 00053
Reptilia - Eoenantiornithiformes - Eoenantiornithidae
Dapingfangornis sp. Li et al. 2006
Zhou 2010
Reptilia - Hongshanornithidae
Parahongshanornis chaoyangensis n. gen., n. sp. Li et al. 2011
Li et al. 2011 1 individual
PMOL-AB00161 - holotype (partial skeleton)
Reptilia
Jeholornis sp. Zhou and Zhang 2002
Zhou 2010
Reptilia - Azhdarchidae
Chaoyangopterus zhangi Wang and Zhou 2003
Zhou 2010 1 individual
LPM-R00076
Reptilia - Istiodactylidae
Liaoxipterus brachyognathus n. gen., n. sp. Dong and Lü 2005
Dong and Lü 2005 1 individual
CAR-0018, nearly complete lower jaw
Reptilia
Longchengpterus zhaoi n. gen., n. sp. Wang et al. 2006
Wang et al. 2006 1 individual
LPM 00023, partial skeleton with incomplete skull; may be synonymous with Liaoxipterus
Philydrosaurus proseilus Gao and Fox 2005
1 individual
LPMC 021 (skull [= SNU field #043]); PMOL-AR00141 (cranium and postcranium of a juvenile specimen) and PMOL-AR00173 (incomplete braincase with upper and lower jaws of a large adult)
Reptilia - Testudines
Testudines indet. Batsch 1788
Zhou 2010
see common names

Geography
Country:China State/province:Liaoning County:Chaoyang
Coordinates: 41.6° North, 120.2° East (view map)
Paleocoordinates:44.8° North, 120.2° East
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Aptian 10 m.y. bin:Cretaceous 3
Key time interval:Aptian
Age range of interval:121.40000 - 113.00000 m.y. ago
Age estimate:maximum 122.1 ± 0.3 Ma (Ar/Ar)
Stratigraphy
Geological group:Jehol Formation:Jiufotang Member:3
Stratigraphic resolution:group of beds
Stratigraphy comments: = Chiufotang Fm. Yuanjiawa Bed = middle of 3rd Member
Chang et al. (2009) provide a Ar/Ar date of 122.1 Ma for the base of the Jiufutang. The age of the top of the formation is uncertain.
Lithology and environment
Primary lithology:gray silty mudstone
Secondary lithology:brown,yellow marl
Includes fossils?Y
Environment:lacustrine - large
Taphonomy
Modes of preservation:body,adpression
Degree of concentration:dispersed
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Articulated whole bodies:all
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:selective quarrying,surface (in situ),field collection
Reason for describing collection:general faunal/floral analysis
Collectors:numerous Collection dates:2004-2015
Collection method comments: LPM: Liaoning Paleontological Museum, Western Liaoning Institute of Mesozoic Paleontology, Shenyang Normal University
Metadata
Database number:79941
Authorizer:M. Carrano, R. Butler Enterer:M. Carrano, R. Butler
Modifier:M. Carrano Research group:vertebrate
Created:2008-03-27 10:59:52 Last modified:2015-04-22 12:32:56
Access level:the public Released:2008-03-27 10:59:52
Creative Commons license:CC BY
Reference information

Primary reference:
26863.ETE K.-Q. Gao, D. T. Ksepka, L. Hou, Y. Duan, and D. Hu. 2007. Cranial morphology of an Early Cretaceous monjurosuchid (Reptilia: Diapsida) from Liaoning Province of China and evolution of the choristoderan palate. Historical Biology 19(3):215-224 [M. Carrano/M. Carrano]

Secondary references:

31276 Z. Dong and J. Lü. 2005. A new ctenochasmatid pterosaur from the Early Cretaceous of Liaoning Province. Acta Geologica Sinica 79(2):164-167 [R. Butler/R. Butler]
49812 K.-Q. Gao, C.-F. Zhou, L. Hou and R. C. Fox. 2013. Osteology and ontogeny of Early Cretaceous Philydrosaurus (Diapsida: Choristodera) based on new specimens from Liaoning Province, China. Cretaceous Research 45:91-102 [P. Mannion/P. Mannion]
54741 D. Hu, Y. Liu, J. Li, X. Xu, and L. Hou. 2015. Yuanjiawaornis viriosus, gen. et sp. nov., a large enantiornithine bird from the Lower Cretaceous of western Liaoning, China. Cretaceous Research 55:210-219 [P. Mannion/J. Tennant]
27917ETE L. Li, D.-y. Hu, Y. Duan, E=p Gong, and L.-h. Hou. 2007. Alethoalaornithidae fam. nov.: a new family of enantiornithine bird from the Lower Cretaceous of western Liaoning. Acta Palaeontologica Sinica 46(3):365-372 [M. Carrano/M. Carrano]
36604 L. Li, J.-Q. Wang, and S.-L. Hou. 2011. A new ornithurine bird (Hongshanornithidae) from the Jiufotang Formation of Chaoyang, Liaoning, China. Vertebrata PalAsiatica 49(2):195-200 [P. Mannion/P. Mannion/M. Uhen]
31277 L. Wang, L. Li, Y. Duan and S.-L. Cheng. 2006. A new iodactylid pterosaur from western Liaoning. Geological Bulletin of China 25(6):737-740 [R. Butler/R. Butler]
55125 X. Wang, B. Zhao, C. Shen, S. Liu, C. Gao, X. Cheng, and F. Zhang. 2015. New material of Longipteryx (Aves: Enantiornithes) from the Lower Cretaceous Yixian Formation of China with the first recognized avian tooth crenulations. Zootaxa 3941(4):565-578 [M. Carrano/M. Carrano/M. Carrano]
30728ETE L. Zhang, Y. Yang, L. Zhang, S. Guo, W. Wang and S. Zheng. 2007. Precious fossil-bearing beds of the Lower Cretaceous Jiufotang Formation in western Liaoning Province, China. Acta Geologica Sinica 81(3):357-364 [M. Carrano/M. Carrano]
33952ETE C.-F. Zhou. 2010. New material of Chaoyangopterus (Pterosauria: Pterodactyloidea) from the Early Cretaceous Jiufotang Formation of western Liaoning, China. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 257(3):341-350 [M. Carrano/M. Carrano]