Shimen village, Yangshulin, Pingquan County (CNU 2007 collection) (Cretaceous of China)

Where: Hebei, China (41.0° N, 118.9° E: paleocoordinates 43.6° N, 120.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jianshangou 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.

• group of beds-level stratigraphic resolution

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

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: Repository: Capital Normal University, Beijing

Primary reference: J. Huang, D. Ren, N. D. Sinitshenkova and C. Shih. 2007. New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China. Zootaxa 1629:39-50 [M. Clapham/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 117535: authorized by Matthew Clapham, entered by Jered Karr on 23.09.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ephemeroptera - Hexagenitidae
Epicharmeropsis quadrivenulosus Huang et al. 2007 mayfly
Epicharmeropsis hexavenulosus n. gen. n. sp. Huang et al. 2007 mayfly
CNU-E-YX-2007001, 2007021, 2007023, 2007024, 2007025, 2007004