Shilong-zhai (Jurassic to of China)

Where: Sichuan, China (32.4° N, 106.9° E: paleocoordinates 32.8° N, 110.6° E)

• coordinate stated in text

• small collection-level geographic resolution

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

• "upper Shaximiao Formation"

•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; lenticular breccia and brown, red, yellow mudstone

• "small, lenticular body of bone-bearing breccia" within a sequence of "brownish yellow or purplish red mudstone, sandstone and quartoze siltstone, which are highly indurated."

Size classes: macrofossils, mesofossils

Collected by Chingking NHM in 1978; reposited in the IVPP

Collection methods: quarrying, mechanical,

Primary reference: M. Chow and T. H. V. Rich. 1982. Shuotherium dongi, n. gen. and sp., a therian with pseudo-tribosphenic molars from the Jurassic of Sichuan, China. Australian Mammalogy 54:127-142 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 47134: authorized by Matthew Carrano, entered by Matthew Carrano on 15.02.2005, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Saurischia - Mamenchisauridae
Mamenchisaurus sp. Young 1954 mamenchisaurid
Mammalia
 Shuotheridia - Shuotheriidae
Shuotherium shilongi n. sp., Shuotherium dongi n. gen. n. sp.
Shuotherium shilongi n. sp. Wang et al. 1998 mammal
An isolated right upper molar, probably not the most distal (IVPP catalog no. V7467)
Shuotherium dongi n. gen. n. sp. Chow and Rich 1982 mammal