Chenchia: Bajocian, China
collected by C. L. Camp & C.-C. Young 1936
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes
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Osteichthyes indet.
Huxley 1880
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"ganoid" | ||||||||||
Reptilia
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Testudinata indet.
(Oppel 1811)
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Yeh 1983 | |||||||||
Plesiochelys or Chengyuchelys (depending on whether there is a mesoplastron or not) | ||||||||||
Reptilia
- Pholidosauridae
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Crocodilia indet.
Owen 1842
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= Pholidosauridae indet.
von Zittel and Eastman 1902
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Young 1939 | |||||||||
Reptilia
- Dinosauria
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Dinosauria indet.
Owen 1842
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Young 1939 | 2 specimens | ||||||||
Reptilia
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Theropoda indet.
Marsh 1881
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1 specimen | |||||||||
= Szechuanosaurus campi
Young 1942
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Young 1942 | |||||||||
nomen dubium belonging to Theropoda | ||||||||||
Sauropoda indet.
Marsh 1878
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1 specimen | |||||||||
= ? Omeisaurus junghsiensis
Young 1939
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Young 1939 | |||||||||
see common names |
Geography
Country: | China | State/province: | Sichuan |
Coordinates: | 29.5° North, 104.4° East (view map) | ||
Paleocoordinates: | 30.1° North, 109.4° East | ||
Basis of coordinate: | based on nearby landmark | ||
Geographic resolution: | small collection |
Time
Period: | Jurassic | Epoch: | Middle Jurassic |
Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
Key time interval: | Bajocian | ||
Age range of interval: | 170.30000 - 168.30000 m.y. ago |
Stratigraphy
Geological group: | Chongqing | Formation: | Shaximiao | Member: | Lower |
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: below Tzeliuching limestone, and therefore below Omeisaurus junghsiensis type site
Wang et al. 2018 suggested an Oxfordian age for the lower beds, rather than Middle Jurassic Several radiometric ages have been reported for the Shaximiao Formation, including 167 Ma or 172 Ma (Zong and Shi, 1997), 167–172 Ma or 178–169 Ma (Gou et al., 2000), 163±3 Ma (Li et al., 2010), 160±4 Ma (Luo et al., 2014), 158±7 Ma (Qian et al., 2016), and 159±2 Ma (Wang et al., 2018). However, more recent studies suggest an older age; Dai et al. 2022 reported a maximum depositional age for the bone-bearing layers of the lower member of the Shaximiao formation to be Bjaocan. Zhou et al. 2022 also supported a late Middle Jurassic age for the Shaximiao Formation (Bathonian-Callovian). |
Lithology and environment
Primary lithology: | not reported |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | dispersed |
Size of fossils: | macrofossils |
Spatial orientation: | random |
Preservation of anatomical detail: | medium |
Disassociated major elements: | some |
Disassociated minor elements: | some |
Spatial resolution: | parautochthonous |
Collection methods and comments
Collection methods: | field collection | ||
Reason for describing collection: | general faunal/floral analysis | ||
Museum repositories: | IVPP | ||
Collectors: | C. L. Camp & C.-C. Young | Collection dates: | 1936 |
Metadata
Also known as: | Chen Chia, Chenxi | ||
Database number: | 47072 | ||
Authorizer: | M. Carrano, E. Vlachos | Enterer: | M. Carrano, E. Vlachos |
Modifier: | G. Varnham | Research group: | vertebrate |
Created: | 2005-02-07 06:54:25 | Last modified: | 2022-05-06 03:27:07 |
Access level: | the public | Released: | 2005-02-07 06:54:25 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
15531. | ETE | C.-C. Young. 1937. New Triassic and Cretaceous reptiles in China. Bulletin of the Geological Society of China 17(1):109-120 [M. Carrano/K. Maguire/M. Carrano] |
Secondary references:
17258 | ETE | Z. Dong, S. Zhou, and H. Zhang. 1983. [Dinosaurs from the Jurassic of Sichuan]. Palaeontologica Sinica, New Series C, Whole Number 162(23):1-136 [M. Carrano/M. Carrano] |
66669 | H. Yeh. 1983. A Jurassic turtle from Chenxi, Hunan. Vertebrata PalAsiatica 21(4):286-291 [E. Vlachos/E. Vlachos] | |
12538 | ETE | C.-C. Young. 1939. On a new Sauropoda, with notes on other fragmentary reptiles from Szechuan. Bulletin of the Geological Society of China 19(3):279-315 [M. Carrano/M. Carrano/M. Carrano] |
12540 | ETE | C.-C. Young. 1942. Fossil vertebrates from Kuangyuan, N. Szechuan, China. Bulletin of the Geological Society of China 22(-34):293-309 [M. Carrano/M. Carrano/M. Carrano] |