Color:  Grover Gravel Chert most commonly ranges from brown to tan, greyish tan, yellowish tan, or cream. Mottling is commonly seen, and rarely banding may be present.  Cortex ranges from a brown, reddish brown, or grayish brown.

Texture:

Luster:

Silica Fabrics / Fossils:

Patina:

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Grover Gravel Chert is associated with the red sands that occur on the surface of Calhoun County, Illinois and into St. Louis County, Missouri.  The red sands are associated with the Lafayette Gravel formation.