1 )(n"(;i.Ass : \'i;r ii;i;ra IKS from Muntana Tkriiarn. J49 



In the lower Madison \'alley, where the upper beds are so well ex- 

 posed, the material is mostly fine.' 



Northeastward from Whitehall the rock of the Titanotherium beds has 

 been much disturbed and metamorijhosed, the light colored clay and 

 sand being in great part changed into red and black slate and quartzite. 

 In one place the strata are nearly vertical. In some places there are 

 mineral veins and the rock has a granitic structure. 



There is doubt that the mountains were as high during the White 

 River epoch as at the present time. 



Besides the places where fossils had been previously found, they 

 were discovered last summer at Canon Ferry, in the Prickly Pear 

 valley, northeast of Whitehall, and on the divide between the Mis- 

 souri and North Boulder valleys. 



The beds in Montana appear in the main to represent the Titano- 

 therium and Oreodon Beds of South Dakota. 



List of Fossils. 

 Fossil Plants. 

 Fish. 



Helodefmoides tuherculatiis Douglass. 

 Ictops acutidens Douglass. 

 GymnoptycJiiis minor (Douglass). 

 Cylindrodon font is Douglass. 

 Scitirus Jeffersorii Douglass. 

 Ischyrotnys typiis Leidy. 

 PalcEolagus temnodon Douglass. 

 Pa/ao/ai^ns brachyodon Matthew. 

 Hycenodon mi)iiitiis Douglass. 

 Hycenodon montaniis Douglass." 

 Limnenetes platyceps Douglass. 

 Limnenetes ? anceps Douglass. 

 Trigeniciis socialis Douglass. 

 Oreodon inacrorhinus Douglass. 

 Eucrotapus helence Douglass. 

 Agriochoerus minimus Douglass. 



^ The exact horizon of these upper beds is uncertain, as no good mammals have 

 been found, but they lie unconformably under the Loup Fork. I have always con- 

 sidered them as White River. 



2 Matthew thinks this is Y>^ohzb\y PseuJopterocion. Bull. Am. Mits. Xat. I/is/., 

 May 19, 1903. 



