Yanzigou, Shanyuan (Cretaceous of China)

Where: Liaoning, China (41.4° N, 124.7° E: paleocoordinates 44.7° N, 126.4° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• Lowest part of Yixian Formation

•He et al 2006 give Ar-Ar date of 123.2±1.0 Ma

•'Lujiatun bed'

• bed-level stratigraphic resolution

Environment/lithology: fluvial; lithology not reported

Size class: macrofossils

Reposited in the IVPP

Collection methods: mechanical,

Primary reference: X. Xu, M. A. Norell, X.-l. Wang, P. J. Makovicky, and X.-c. Wu. 2002. A basal troodontid from the Early Cretaceous of China. Nature 415:780-784 [M. Carrano/M. Carrano/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 55685: authorized by Matthew Carrano, entered by Kaitlin Maguire on 02.11.2005, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Avetheropoda - Troodontidae
Sinovenator changii Xu et al. 2002 coelurosaur
IVPP V12583 (referred specimen)
 Neornithischia -
Liaoceratops yanzigouensis n. gen. n. sp.2 Xu et al. 2002 ornithischian
IVPP V12738
Mammalia
 Tribosphenida -
Acristatherium yanensis n. gen. n. sp.1
Acristatherium yanensis n. gen. n. sp.1 Hu et al. 2010 eutherian
IVPP V15004