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Lower-Middle Ordovician
Pogonip Group
(approx. 480 millions of years ago)
MILLARD CO., UTAH



  Stibaraster ratcliffei
   Lehman Formation
   size:  
   Courtesy:  University of Utah
   Remarks: ventral surface
 
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  Presbynileus ibexensis
   Filmore Formation
   size: 0.9" (2.3 cm) 
   Remarks:
 
 
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  Pseudocybele
   Courtesy:  The Gunther family
   size:  
   Remarks:  
 
 
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  Ptyocephalus yersini
   Courtesy: Jim McEwen 
   size:  0.94" (2.4cm)
   Remarks:  
 
 
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Last Updated: 4/1/20