Ok, here is a recent article
Ebirth, D. A., 1994. Depositional environments and facies transitions of
dinosaur-bearing Upper Cretaceous redbeds at Bayan Mandahu (Inner Mongolia,
People's Republic of China). Can. J. Earth Sci. Volume 30: 2196-2213.
This article is made by Canadian scientist who visited the sites. Sites in an
area that hasn't changed in over 70 million years!
Tracy