Color:  Selkirk Chert can range in color from light gray to yellowish gray, dark gray, , black or brown.  White to light gray bands or clouds are present.

Texture:  Medium to fine grain

Luster: grey, yellowish grey, brown grey, brown, to dark grey

Silica Fabrics / Fossils: Highly fossilferous, fossils include: brachiopods, corals (solitary and colonial), crinoids, echinoderms, tentaculitids, black stylolite

Patina:  

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Selkirk Chert is associated with the Dundee Formation Limestone with primary outcroppings in Cheapside, Ontario and along the Sandusky Creek to the Lake Erie confluence.  Sources have been reported in Lucas County, Ohio, Cheboygan County, Michigan, and Haldimand County Ontario. Can be found in nodules, beds, and lenses.  Manitoba reports outcroppings near Lower Fort Gary on the banks of the Red River and East Selkirk.  Selkirk Chert has been reported into Minnesota.