| 11. | The argillite probably formed from volcanic ash falls.
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| 12. | The deposits are hosted in shear zones in argillite of the Precambrian Belt Supergroup.
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| 13. | This technique lends stability to the fragile argillite.
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| 14. | Rocks on North Solitary Island consist of mudstone and a light green brittle sillicaceous argillite.
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| 15. | The rock types are; vitreous quartzite, sericitic quartzite, and siltite-argillite.
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| 16. | The impermeability of argillite is primarily to blame for Sourland Mountain s extremely poor aquifer.
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| 17. | For the Haida, argillite was perhaps part of a movement towards greater financial gain.
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| 18. | Prior to 1820 there were no argillite carvings found in any public or private collections.
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| 19. | There is also Precambrian sedimentary argillite, dating back to 1.7 billion years ago.
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| 20. | In the Skidegate dialect of the Haida language argillite is called " kwawhlhal ".
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