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Dec 31, 1979
Earth Sciences Note
… of the Lower Cretaceous McMurray Formation. Some of these clays can … to continue. Shales from the Porcupine Hills Formation seem best suited …
Dec 31, 1977
Earth Sciences Note
… rocks older than the Kootenay Formation (Jurassic - Lower … Wapiabi, Horseshoe Canyon, or Porcupine Hills Formation clays because of …