Dujia: Bathonian - Callovian, China
collected by Zhang & Zheng 1977

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Mamenchisaurus hochuanensis Chao 1965
1 individual
Mamenchisaurus jingyanensis Zhang et al. 1998
Zhang et al. 1998 1 specimen
CV00219, " Two isolated teeth, a column of medial and posterior cervicals with articulated ribs, four fused sacrals, several medial and posterior caudals, a complete right scapulacoracoid, two complete humeri, one distal femur, and semi-complete tibia and fibula"
see common names

Geography
Country:China State/province:Sichuan County:Rongxian
Coordinates: 29.5° North, 104.4° East (view map)
Paleocoordinates:29.4° North, 109.1° East
Basis of coordinate:based on nearby landmark
Altitude:595 meters
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Middle Jurassic
Key time interval:Bathonian - Callovian
Age range of interval:168.30000 - 163.50000 m.y. ago
Stratigraphy
Geological group:Chongqing Formation:Shaximiao Member:Upper
Stratigraphic resolution:bed
Stratigraphy comments: 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
Size of fossils:macrofossils
Fragmentation:occasional
Temporal resolution:snapshot
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Collectors:Zhang & Zheng Collection dates:1977
Collection method comments: discovered by the Second Brigade of the Regional Geological and Aerial Survey Corp. from the Sichuan Department of Geology
Metadata
Database number:60064
Authorizer:M. Carrano, A. Dunhill Enterer:M. Carrano, B. Allen
Modifier:G. Varnham Research group:vertebrate
Created:2006-04-28 10:37:14 Last modified:2022-05-06 03:45:57
Access level:the public Released:2006-04-28 10:37:14
Creative Commons license:CC BY
Reference information

Primary reference:

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]

Secondary references:

67716 Y. Zhang, K. Li, and Q. Zeng. 1998. A new species of sauropod from the Late Jurassic of the Sichuan Basin (Mamenchisaurus jingyanensis sp. nov.). Journal of the Chengdu University of Technology 25(1):61-68 [A. Dunhill/B. Allen]