Also known as Ho Chuan, Hechuan, Taihe

Where: Sichuan, China (30.1° N, 103.8° E: paleocoordinates 29.8° N, 108.4° E)

• coordinate based on nearby landmark

• small collection-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: fluvial; red siliciclastic sediments

Size class: macrofossils

Collected in 1957; reposited in the IVPP

Collection methods: quarrying, mechanical,

• discovered by Petroelum Geology Dept. of Sichuan province

Primary reference: S. Chao. 1965. Wǒguó de dà kǒnglóng yī héchuān mǎmén xī lóng [China’s largest dinosaur—Hehchuan-Mamenxian dragon]. Sheng wu xue tong bao [Bulletin of Biology] 1965(4):35-37 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 53662: authorized by Matthew Carrano, entered by Matthew Carrano on 13.09.2005

Creative Commons license: CC BY (attribution)