Sample I-49, Xiajiajie, Liaoyuan (Cretaceous of China)

Where: Jilin, China (42.7° N, 125.4° E: paleocoordinates 46.2° N, 126.7° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jingangshan Member (Yixian Formation), Early/Lower Aptian (125.5 - 122.5 Ma)

• U-Pb dating from the Sihetun area indicates that the Yixian Formation ranges from 124.9 ± 1.7 Ma to 122.8 ± 1.6 Ma (Yang et al., 2007). Chang et al. (2017) obtained Ar/Ar ages of 125.8 ± 1.0 Ma and 126.0 ± 0.8 Ma from the Lujiatun Unit, the lowest part of the Yixian Formation, below the lacustrine shales. They infer an age of 125.22 ± 0.22 Ma for the lower part of the Jianshangou Unit, based on their date and previously published information. It is not clear if the formation is the same age elsewhere, but for now the same age is assigned.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, brown, yellow mudstone

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: Repository: Tianjin Institute of Geology and Mineral Resources

Primary reference: Y. C. Hong. 1982. Mesozoic Fossil Insects of Jiuquan Basin in Gansu Province 1-187 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155010: authorized by Matthew Clapham, entered by Matthew Clapham on 26.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Cercopidae
Sinocercopis liaoyuanensis n. gen. n. sp. Hong 1982 froghopper
Ll1006 (I-49-65)
 Hemiptera - Corixidae
Karataviella sp. Becker-Migdisova 1949 water boatman
Il1001 (I-49-69)
 Coleoptera - Staphylinidae
Sinostaphylius xiajiajieensis n. gen. n. sp. Hong 1992 rove beetle
Il1004 (I-49-64)
 Coleoptera - Coptoclavidae
Coptoclava longipoda Ping 1928 beetle
Il1003 (I-49-67)
 Ephemeroptera - Hexagenitidae
Ephemeropsis trisetalis Eichwald 1864 mayfly
Il1002 (I-49-68)
 Odonata -
Dissurus liauyuanensis n. sp. Hong 1982 true dragonfly
Ll1005 (I-49-57)