Color: La Port City Chert is most commonly a medium to dark gray.  Less commonly the color ranges from a white to a light gray.

Texture: 

Luster:

Silica Fabrics / Fossils: Crinoid, ossicles, and ostrocods

Patina:

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

La Port City Chert is associated with the La Port City Chert Formation of the Devonian System.  Primary outcroppings occur in Blackhawk, Buchanan, Delaware, Polk, and Hardin counties, Iowa