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| Eroded Chalk Bluffs 
   
 | Collapsed Chalk Monument 
   
 | Chalk Collapse at Monument Rocks 
   
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| Monument Rocks 
   
 | Monument Rocks 
   
 | Base of Sphinx after Collapse 
   
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| The Sphinx (1983) 
   
 | Pearlette Ash Outcrop 
   
 | Pearlette Ash Pit 
   
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| Chalk Bluffs South of Castle Rock 
   
 | Castle Rock 
   
 | Fault in Chalk Formation 
   
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| Grazing Cattle 
   
 | Quarried Ash Bed 
   
 | Chalk Bluffs 
   
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| Monument Rocks 
   
 | Castle Rock—Northeast Side 
   
 | Castle Rock (1965) 
   
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