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Middle Cambrian
Pierson Cove Formation
(approx. 520 million years ago)

DRUM MOUNTAINS
MILLARD CO., UTAH




  Dorypyge swasii
   Courtesy: Jim McEwen
   Size: 1.6" (4.1 cm)
   Remarks: equivalent to  Kootenia
 
 
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  Dorypyge swasii
   Courtesy: The Gunther Family
   Size: cm scale
   Remarks:  Eight
 
 
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  Olenoides trispinus
   Courtesy: Robert Schacht
   Size: 2.6" (6.67 cm)
   Remarks:  
 
 
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  Olenoides nevadensis
   Courtesy: Jim McEwen
   Size: 2.7" (6.8 cm)
   Remarks:  spines are free-standing
 
 
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  Olenoides nevadensis
   Courtesy: Jim McEwen
   Size: 3.6" (9.2 cm)
   Remarks:  
 
 
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  Altiocculus drumensis
   Courtesy: QJS
   Size: 1.9" (4.8 cm)
   Remarks: equivalent to Alokistocare
 
 
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  Olenoides sp.
   Courtesy: S. Halgedahl/R. Jarrard
   Size: 1.7" (4.4 cm)
   Remarks: pygidium
 
 
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  Bolaspidella drumensis
   Courtesy: QJS
   Size: 0.53" (1.35 cm)
   Remarks: several axial spines missing
 
 
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  Dorypyge swasii
   Courtesy: Dustin Rooks
   Size: 2.83" (7.2 cm)
   Remarks:  with Modocia brevispina
 
 
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  Olenoides trispinus
   Courtesy: Dustin Rooks
   Size: 2.87" (7.3 cm)
  
 
 
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  Modocia brevispina
   Courtesy: Jim McEwen
   Size:  1.0" (2.6 cm)
   Remarks:  
 
 
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  Pseudoarctolepis sharpi
   Courtesy: The Gunther Family
   Size:  9.8 cm (tip to tip)
   Remarks:  Phylocarid
 
 
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Last Updated: 4/1/20