Also known as Zigong

Where: Sichuan, China (29.4° N, 104.8° E: paleocoordinates 29.4° N, 109.5° E)

• coordinate estimated from map

• small collection-level geographic resolution

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

• "second member"

•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 in 1995

Collection methods: quarrying, mechanical,

Primary reference: H. Ouyang and Y. Ye. 2002. The first mamenchisaurian skeleton with complete skull: Mamenchisaurus youngi. Sichuan Science and Technology Press, Chengdu 1-111 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58975: authorized by Matthew Carrano, entered by Matthew Carrano on 02.03.2006

Creative Commons license: CC BY (attribution)