Where: Sichuan, China (30.5° N, 105.6° E: paleocoordinates 30.6° N, 110.0° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Upper Member (Shaximiao Formation), Bathonian to Bathonian (168.3 - 163.5 Ma)

• 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).

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by Chongqing Museum of Natural History in 1977

Primary reference: H. Tong, L. Li, and H. Ouyang. 2014. A revision of Sinaspideretes wimani Young & Chow, 1953 (Testudines: Cryptodira: Trionychoidae) from the Jurassic of the Sichuan Basin, China. Geological Magazine 151(4):600-610 [P. Holroyd/P. Holroyd/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 179921: authorized by Patricia Holroyd, entered by Patricia Holroyd on 04.07.2016

Creative Commons license: CC BY (attribution)