Near Chaomidian Village, CNU 2009 collection (Cretaceous of China)

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

• coordinate estimated from map

• outcrop-level geographic resolution

When: Yixian Formation, Early/Lower Aptian (125.5 - 122.5 Ma)

• U-Pb dating suggests that the Sihetun area 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.

• 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: G. V. Nikolajev and D. Ren. 2010. New genus of the subfamily Geotrupinae (Coleoptera: Scarabaeoidea: Geotrupindae) from the Jehol Biota. Acta Geologica Sinica 84(4):673-675 [M. Clapham/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123472: authorized by Matthew Clapham, entered by Jered Karr on 23.01.2012, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

 Coleoptera - Geotrupidae
Parageotrupes incanus n. gen. n. sp.
Parageotrupes incanus n. gen. n. sp. Nikolajev and Ren 2010 earth-boring dung beetle
 Mecoptera - Eomeropidae
Typhothauma excelsa n. sp. Zhang et al. 2012 scorpionfly