Hyracodon Lower Tooth, Fossil, Badlands, South Dakota, Oligocene, R863

 
  
  

   Type: Fossil lower tooth from
   
    Hyracodon nebraskensis
   
   .
  
  

   

   Locality: Private land in Pennington County, South Dakota
  
  

   

   Age: Oligocene, 30 Million Years Ago