Last Updated: Nov 05, 2017     Views: 5

On the east and west side of the Main Library, limestone was used for its base building material. All sedimentary rock is fossiliferous, commonly known as limestone.  A magnifying glass will help with seeing the fossils. Usually, small shells can be seen if you look closely.  
 
On the west side, about fifty feet down is a “rust stain” where iron pyrite was deposited in the sediment.  The brown stain is where the iron has rusted and made a brown stain. 
 
 

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