Color:  Ullin Chert is a brownish gray color

Texture: Course to medium grain

Luster: Dull

Silica Fabrics / Fossils: Fossiliferous

Patina:

Heat Treatment: 

Knapping:  Poor to moderate flaking quality
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Ullin Chert is associated with the Ullin Formation of southern Illinois.  Primary outcroppings occur along the Mississippi River Bluffs in Monroe, St. Clair, Madison, Union, Pulaski, and Hardin counties, Illinois.