Shidongzi (Cretaceous of China)

Where: Hebei, China (41.0° N, 117.9° E: paleocoordinates 43.5° N, 119.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: 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.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, tuffaceous mudstone

Size classes: macrofossils, mesofossils

Preservation: adpression

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

Primary reference: Y. C. Hong. 1984. Insecta. Palaeontological Atlas of North China, II, Mesozoic Volume 128-185 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155160: authorized by Matthew Clapham, entered by Matthew Clapham on 29.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Palaeontinidae
Jibeicossus qingshilaense n. gen. n. sp. Hong 1984 true bug
 Hemiptera - Procercopidae
"Luanpingia senjituensis n. sp." = Stellularis senjituensis
"Luanpingia senjituensis n. sp." = Stellularis senjituensis Hong 1984 froghopper
 Hemiptera - Coreidae
Bibiticen hebeiensis n. gen. n. sp.
Bibiticen hebeiensis n. gen. n. sp. Hong 1984 leaf-footed bug
 Trichoptera - Necrotauliidae
Necrotaulius qingshilaense n. sp. Hong 1984 caddisfly