Refractory Clays of Northern Ontario

IN northern Ontario, refractory clay is found on four rivers of the James Bay watershed : the Abitibi, the Mattagami, the Missinaibi, and the Moose. The clay all belongs to the same geological formation ( the Mattagami of Lower Cretaceous age) , and occurs within a structural depression or 'basin', the boundaries of which have never been defined but which appears to cover at least 1,500 square miles of territory.
Keywords: Clay, Clay, kaolin, Lignite . . . . . . . . . . ., Lower Cretaceous, refractory, Clays, Deposits, Kaolin, Lignite, Lignites, refractory, test, Tests
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