Color:  Madison chert is white to a grayish white with black dendritic inclusions.

Texture:

Luster:

Translucency:

Silica Fabrics / Fossils:  Abundant crinoid columnals

Patina:

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Madison Chert is associated with the Madison Limestone Formation of Montana, Idaho, northern Utah and northwestern Wyoming.  Primary outcroppings occur in the Absarokas in Park County, Wyoming.  Named for Madison Range, Montana.