Sihetun (NIGP coll) (Cretaceous of China)

Where: Liaoning, China (41.6° N, 120.8° E: paleocoordinates 44.5° N, 122.3° 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. 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 mudstone

Size class: macrofossils

Preservation: adpression

Reposited in the NIGPAS

Primary reference: D. Y. Huang, D. Azar, and A. Nel. 2017. The oldest 'Megapodagrionidae' (Odonata, Zygoptera) discovered in the Lower Cretaceous Yixian Formation, China. Cretaceous Research 84:426-430 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 190928: authorized by Matthew Clapham, entered by Matthew Clapham on 22.12.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Palaeontinidae
Ilerdocossus hui Ren et al. 1998 true bug
NIGP 154994
 Odonata - Megapodagrionidae
Cretapodagrion sibelleae n. gen. n. sp.
Cretapodagrion sibelleae n. gen. n. sp. Huang et al. 2017 flatwing
NIGP 166620