Color:  Shell Rock chert is mottled white to light gray in color.  It has light gray colonial corals present.

Texture: Medium grain

Luster: Dull

Silica Fabrics / Fossils: Colonial corals

Patina:

Heat Treatment: 

Knapping:  Good flaking quality
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Shell Rock Chert has primary outcroppings at Sherbun's Creek, southwestern Mower County, Minnesota.  Found in glacial tills in north central Iowa.