Color: Spearfish Chert ranges from a grayish red or dusty red to purple.
Texture:
Luster:
Silica Fabrics / Fossils:
Patina:
Heat Treatment:
Knapping:
Distribution:
Distribution Comments: Spearfish Chert is associated with the Spearfish Limestone Formation of
western South Dakota, northwestern Nebraska and into Wyoming.
Primary outcroppings occur in the Black Hills of South
Dakota.
Projectile point made from this material:
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