EOCENE AND OLIGOCENE TITANOTHERES OF MONGOLIA 



907 



Preliminary lists of middle 



and upper Eocene and Oligocene Mongolian fossil faunas as determined to June SO, 

 1925, by shorn, Matthew, and Granger 



OLIGOCENE: HOULDJIN FORMATION 



Granger and Berke}' (August 7, 1922, p. 4) 



The type locality of the Houldjin formation is 5 

 miles south of Iren Dabasu. It consists of sand and 

 gravel, 30 feet in total thickness; with a coarse sandy 

 conglomeratic member at base (5 feet), fossUiferous. 

 Originally characterized by the following fossil con- 



tent: (1) A rhino cerid [ICaenopus or Praeaceratherium, 

 sp., ? Cadurcotherium sp.]; (2) a large carnivore [Ente- 

 lodon dirus, equal in size to Dinohyus hollandi, lower 

 Miocene of Nebraska]; (3) an artiodactyl of the size 

 of a Virginia deer [1 Entelodon sp.]; (4) an enormous 

 mammal, possibly related to or identical with Balu- 

 chiiherium of Baluchistan [1 Baluchitherium]; (5) a tor- 

 toise of large size [^Testudo], 



