Portage Lake Rhyolite
AKA: Portage Lake Quartzite
Description of Physical Characteristics:
Color: Portage
Lake Rhyolite is varying shades of red with conglomerate or copper
inclusions being present.
Texture: Course to medium grain
Luster:
Silica Fabrics / Fossils:
Patina:
Heat Treatment:
Knapping: Poor to good flaking quality
depending on the texture.
Distribution:
Portage Lake Rhyolite has is found on the south shore of Isle Royale,
Michigan. Artifacts using Portage Lake Rhyolite has not been found
outside of Isle Royale.
Projectile point made from this material:
Pictures Provided By:
References: (See Reference Page, Entry Number):
Similar Material:
Commonly made projectile point from this material:
Archaeological Context:
