Color:  Eagle Point Chert ranges from a light gray to a gray.  Fossils form whitish to pinkish speckles.

Texture:

Luster:

Silica Fabrics / Fossils: Crinoid columnals and brachiopods

Patina:

Heat Treatment: Heat treatment produced reddish hues, this is especially seen in the fossils which turn pink.

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Eagle Point Chert is associated with the Dunleith Formation, Eagle Point Member of northern Illinois.  Primary outcroppings are exposed along the lower Vermillion River just above the Illinois River confluence near Starved Rock..