AKA: Bridger Basin Chert, Green River Chert, Oil Chert, Zebra Chert, Shavetail Chert, Cedar Mountain Chert

Variations include: Sevenmile Ridge Chert, Algal Chert

Color: Tiger Chert is primarily dark brown with wide tan banding.  If the material is smaller, the tan could be primary with the darker brown bands.

Texture: Fine grain

Luster: Dull

Translucency:  Opaque

Silica Fabrics / Fossils:

Patina:

Heat Treatment:  Heat treatment increases the color and luster.  Heat treatment was commonly used to make it easier to remove the limestone cortex.

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Tiger Chert is associated with the Bridger Formation and is primarily found as nodules in the Bridger Basin of Wyoming and into the Uinta Mountain range of southwestern Wyoming and northeastern Utah.  It has been found into northwestern Colorado.  It is part of the Pine Springs assemblage.  Primary outcroppings occur in Pine Mountain, Sage Mountain, and Cedar Mountain northwest of Lone Tree, Wyoming.