Where: Liaoning, China (41.4° N, 121.4° E: paleocoordinates 43.9° N, 123.6° E)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Yixian Formation (Jehol Group), Barremian (130.0 - 125.5 Ma)

• thought to be Barremian by Li and Luo 2006 based on Yixian Formation radioisotopic dates

Environment/lithology: lacustrine; lithified, gray, silty shale

Size class: macrofossils

Preservation: adpression, soft parts, original carbon

Collection methods: surface (in situ),

Primary reference: Q. Ji, Z.-X. Luo, C.-X. J.R. Yuan Wible, J.-P. Zhang, and J.A. Georgi. 2002. The earliest known eutherian mammal. Nature 416:816-822 [W. Clyde/J. Finarelli/R. Whatley] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13937: authorized by Will Clyde, entered by John Finarelli on 03.05.2002, edited by John Alroy, Matt Carrano and Roger Benson