Sample II8P5L4, West Chijinqiao, Yumen City (Cretaceous of China)

Where: Gansu, China (40.1° N, 97.4° E: paleocoordinates 39.5° N, 98.0° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Chijinbao Formation, Aptian (125.0 - 113.0 Ma)

• The combined biostratigraphic and numerical age data suggest that the Changma Basin began accumulating sediment no older than Hauterivian (based on pollen records), is older than the Coniacian (based on the crosscutting dykes), but is likely Barremian to Aptian based on the similarities to the Jehol biota (Suarez et al., 2013)

Environment/lithology: lacustrine; lithified, brown, yellow, silty mudstone

• The formation is 591 m in thickness and composed of yellow – brown coarse clastic sediment interbedded with some siltstone and mudstone.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

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 155009: authorized by Matthew Clapham, entered by Matthew Clapham on 26.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Trichoptera -
Qinquania combinata n. gen. n. sp.
Qinquania combinata n. gen. n. sp. Hong 1982 caddisfly
Kj1302 (P5L4-1)
 Odonata -
Cercus clavus n. gen. n. sp., Dissurus qinquanensis n. gen. n. sp.
Cercus clavus n. gen. n. sp. Hong 1982 true dragonfly
Kj1033
Dissurus qinquanensis n. gen. n. sp. Hong 1982 true dragonfly
Kj11
 Odonata - Aeschnidiidae
"Archaeogomphus sp." = Yixiangomphus
"Archaeogomphus sp." = Yixiangomphus Lin 1986 small darner
Kj111