Sample II8P2L1, 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 155034: authorized by Matthew Clapham, entered by Matthew Clapham on 27.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Odonata - Aeschnidiidae
Brunneaeschnidia sp., Brunneaeschnidia jiuquanensis n. gen. n. sp., "Archaeogomphus sp." = Yixiangomphus
Brunneaeschnidia sp. Hong 1982 small darner
Kj10
Brunneaeschnidia jiuquanensis n. gen. n. sp. Hong 1982 small darner
Kj1004, Kj1038
"Archaeogomphus sp." = Yixiangomphus Lin 1986 small darner
Kj1002-2
 Coleoptera - Leptopodocoleidae
Leptopodocoleus sarmentosus n. gen. n. sp. Hong 1982 beetle
Kj1020
 Coleoptera -
Leptocoleus lenis n. gen. n. sp., Obesofemoria "sp. 1", Obesofemoria chijinqiaoensis n. gen. n. sp., Vago oblonga n. gen. n. sp.
Leptocoleus lenis n. gen. n. sp. Hong 1982 beetle
Kj1162
Obesofemoria "sp. 1" Hong 1982 beetle
Kj1151
Obesofemoria chijinqiaoensis n. gen. n. sp. Hong 1982 beetle
Kj1152
Vago oblonga n. gen. n. sp. Hong 1982 beetle
Kj1001
 Coleoptera - Carabidae
Sinocarabus longicornutus n. gen. n. sp. Hong 1982 ground beetle
Kj1024
 Coleoptera -
Gansucupes attenuatus n. gen. n. sp.
Gansucupes attenuatus n. gen. n. sp. Hong 1982 beetle
Kj1004
 Coleoptera - Ommatidae
Brochocoleus punctatus n. gen. n. sp.
Brochocoleus punctatus n. gen. n. sp. Hong 1982 beetle
Kj1005
 Coleoptera -
Mesoscarabaeus corneus n. gen. n. sp.
Mesoscarabaeus corneus n. gen. n. sp. Hong 1982 scarab beetle
Kj1011, 1612
 Coleoptera - Agyrtidae
Prosilpha nigrita n. gen. n. sp.
Prosilpha nigrita n. gen. n. sp. Hong 1982 primitive carrion beetle
Kj1037
 Trichoptera -
Zygobasis mesozoica n. gen. n. sp.
Zygobasis mesozoica n. gen. n. sp. Hong 1982 caddisfly
Kj1120
 Diptera - Chironomidae
Manlayamyia dabeigouensis Zhang 1991 non biting midge
Kj1018, 1035-1, 1026