Early Squirrel, Ischyromys typus, Fossil Partial Upper Skull, South Dakota I248

 
 

  
   Type:
  
  This is a fossil partial upper skull of the early Squirrel,
  
   Ischyromys typus
  
  .  This specimen is the front nose section of the upper skull and includes the base of both of the incisors as well as the roots of some of the molars.  Tough to find these little squirrels lately.
 
 

  

 
 

  
   Locality:
  
  Private land in Pennington County, South Dakota
 
 

  

 
 

  
   Age:
  
  Oligocene, 30 Million Years Ago
 
 

  

 
 

  Note that ruler increments are 1/16 inch.
 
 

  

 
 

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