Kettle Point Chert

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Class Natural Material
Type Stone

Other Names

  • Port Franks Chert (Eley & von Bitter 1989; Jury 1949)
  • Port Franks Chalcedony (Fox 1971/1977)
  • Port Franks Flint (Wright 1972)

Similar Materials


Detailed characterization of Kettle Point Chert is provided by Janusas (1984)


  • Exterior (weathered) surface colours (Munsell Scale) range from 10R 6/4 (Pale Red) to 2.5Y 5/2 (grayish-brown)
  • Interior surface colours (Munsell Scale) range from 2.5YR N/6 (gray) to 2.5Y N/6 (gray)
  • Waxy lustre
  • Brassy and greenish hues due to mineralization (marcasite and pyrite) (Eley & von Bitter 1989)



Geologic Context

  • Interface of Middle Devonian Ipperwash Formation Limestone and Upper/Late Devonian Kettle Point Formation Shales (Janusas 1984:2)



Janusas 1984:2-5

  • Subsurface outcrops within Lake Huron, north of Cape Ipperwash
  • Chert bed ranges from 2 mm to 75 mm thick
  • Bed exposed by roadcut in Thedford, Ontario
  • Eley and von Bitter (1989) identify Locality 1 at Kettle Point, Lake Huron.
    • Chert present immediately below and within Kettle Point Formation black shales


Map of Source Locations and Relevant Sites

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Red Dot: Source of Kettle Point Chert; Green Dot: Site assemblage that contains Kettle Point Chert
Note: In the interest of protecting our shared cultural heritage from those who would do it harm, intentional or otherwise, only approximate site locations are provided here.

Archaeological Contexts

Technological Notes

Digital Resources

Detailed outcrop and core measured sections of the Kettle Point formation, southwestern Ontario

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