Professor Marsh’s Monograph of the Dinocerata. 177 
“The localities in which the Dinocerata have been found 
are on both sides of the Green River, and mainly south of the 
Union Pacific Railroad, in Wyoming. Of two pecceen tea 
viduals in the Yale Museum, about equal numbers were found 
east and west of this river, the distance between the extreme 
localities in this direction being more than one hundred miles. 
The map below covers this region. 
4 >the Dinsewats have hitherto been found ina well marked 
8eological horizon of the middle Eocene. oe oe 
MAP SHOWING REGION OF DINOCERAS BEDS. 
