Liangjiazi-Yikeshu-Yaohuangtun villages, Fuxin (Cretaceous of China)

Where: Liaoning, China (42.1° N, 121.7° E: paleocoordinates 45.0° N, 123.1° E)

• coordinate estimated from map

• local area-level geographic resolution

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

• Middle-upper part of formation. 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.

• member-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, fine-grained, tuffaceous sandstone and lithified, fine-grained, brown, yellow sandstone

• Middle part: volcanic tuff and fine sandstone, intercalated are shales and thin layers of coal. Upper part: yellow-brown fine sandstone and shale with intercalated sandstone. The fossils are from both parts.

Size classes: macrofossils, mesofossils, microfossils

Collection methods: bulk,

Primary reference: K. Xu, Y. Li, R. Li and R. Wang. 1998. Discovery of the Dinosaur fossil in Heishan, Liaoning and its stratigraphical significance. Journal of stratigraphy (=Dicengxue-zazhi) 22(3):227-231 [J. Alroy/S. Kuemmell/S. Kuemmell]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 36969: authorized by John Alroy, entered by Susanna Kümmell on 20.02.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ephemeroptera - Hexagenitidae
Ephemeropsis trisetalis Eichwald 1864 mayfly
 Leptolepidiformes - Leptolepididae
Lycoptera sp. Müller 1847
 Czekanowskiales -