Variations include: Coeymans Chert, New Scotland Chert, Kalkberg Chert, Port Ewen Chert, Becraft Chert, Licking Creek Chert, Shiver Chert

Color:  Helderberg chert ranges from mottled white to light cream, light gray, and light blue commonly mottled and fossiliferous. 

Texture:  Fine grain

Luster: Dull to waxy

Silica Fabrics / Fossils:  Fossils include brachiopods, crinoids, trilobites, coral and conodonts. 

Patina: The patina is lighter than the interior color, usually a white to grayish white.

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Helderberg chert is associated with the Helderberg Group of eastern New York, western Maryland, New Jersey, eastern Pennsylvania, Virginia, and northern West Virginia occurring as nodules in Monroe and Carbon counties, Pennsylvania and New Scotland, Albany County, New York.