Name: Liaoning Province
Age: Early Cretaceous
 Jason Hilton-The National Museum of Scotland. Personal communication.
 Barrett, P. M. (2000) Evolutionary consequences of dating the Yixian Formation. TREE. 15, 99-103.
 Swisher III, C. C., Wang, X., Zhou, Z., Wang, Y., Jin, F., Zhang, J., Xu, X., Zhang, F. and Wang, Y. (2002) Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning, China: New 40Ar/39Ar dating of the Yixian and Tuchengzi Formations. Chinese Science Bulletin. 47, 135-138.
I would like to thank Dr Jason Hilton of the National Museum of Scotland for kindly offering help with some of the more obscure information.