Color:  Grassy Knob Chert ranges in color from a pale yellowish gray to a light
olive brown.

Texture:  Fine Grain

Luster: Dull

Silica Fabrics / Fossils: Few poorly preserved fossils

Patina:

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Grassy Knob Chert overlays the Bailey Limestone formation of Indiana, Illinois, and into Kentucky.  Primary outcroppings are found on the west side of Grassy Knob, Jackson County and along the Mississippi River bluffs in Jackson and Union counties, Illinois.