Irdin Manha Formation

The Irdin Manha Formation is a geological formation from the Eocene located in Inner Mongolia, China, a few kilometres south of the Mongolian border 
Description.
U.S. paleontologists Henry Fairfield Osborn and Roy C. Andrews discovered two premolars on the site in 1923, and assigned the specimen to the new genus "Eudinoceras" because he believed it to be related to "Dinoceras" (now known as "Uintatherium"). Within a decade, however, as more complete specimens were recovered, the animal was identified as a Mongolian relative to the North American pantodont "Coryphodon".