Also known as Shizitan, Changshou

Where: Sichuan, China (30.0° N, 107.3° E: paleocoordinates 30.6° N, 111.8° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• Between the Chiating Beds and Chungking Beds; now = Shangshaximiao = Upper Shaximiao Fm.

•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; red shale and sandstone

Size class: macrofossils

Collected by So in 1955-1956; reposited in the IVPP

Collection methods: salvage, surface (in situ),

Primary reference: C.-C. Young. 1958. New sauropods from China. Vertebrata PalAsiatica 2(1):1-28 [M. Carrano/K. Maguire/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 57771: authorized by Matthew Carrano, entered by Kaitlin Maguire on 21.12.2005

Creative Commons license: CC BY (attribution)