154 Annals of the Carnegie Museum. 



in height on the west side of the valley of Flint Creek, beginning 

 about one mile north of the village of New Chicago and extending 

 southward several miles. The fossils were obtained within two or 

 three miles of the village. 



The Madison Valley Beds. 



The Loup Fork beds of the Lower Madison Valley are, in greaf />ari, 

 at least, of stream valley origin. By this I mean such deposits as usually 

 accumulate in valleys of rivers and smaller streams, including channel 

 deposits, mud flats, sand bars, flood plains, ponds, and small lakes. 



The material is principally sand, sandy clay, and gravel, partly with- 

 out extensive uniformity of stratification. Yet in part the beds are 

 well stratified. This is especially true of those of pure volcanic ash, 

 and it seems almost certain that at times during the Loup Fork there 

 were quite extensive marshes, or lakes. 



During last season these beds were identified in the Missouri Valley 

 east of Winston by mammalian fossils. The remains of camels {Pro- 

 camelus') and horses {Protoliippiis) were found on the north Boulder 

 Creek in beds that undoubtedly belong to this division of the Loup Fork. 



An abundance of fossil leaves was found both in the Lower Madison 

 Valley and east of Winston. 



Partial List of Species. 

 Sciunis airtomyoidcs Douglass. 

 Palcearctomys inontauiis Douglass. 

 PalcBcirctomys macrorhinus Douglass. 

 My lagan his / pristinits Douglass. 

 Mylagauliis ? proxinnts Douglass. 

 Mustela viinor Douglass. 

 y-EIi/fodon sp. 



Dinocyon ossifragiis Douglass. 

 Aphelops ceratorhiniis Douglass. 

 Protohippus. 



Hippotheriiim isonesiun Cope. 

 Merycocha'riis nltiramiis Douglass. 

 Meiycoclui'riis iiiadisouiiis Douglass. 

 Gomplwtlicrium {Protomeryx ?^ scriis Douglass. 

 Protolabis montamis Douglass. 

 Procamelus inadisoiniis Douglass. 

 Procamelus lacustris Douglass. 

 Blastomeryx gemmifer Cope. 



