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Volcanic and non-volcanic partings are exposed in coal beds of the Tertiary Beluga and Sterling Formations along the shores of the Kenai lowland, Alaska. About two-thirds of the partings originated as air-fall tephra which fell in coal-forming swamps. The tephra partings in the Pliocene strata are unaltered or slightly altered and have a characteristic mineral assemblage of volcanic glass +_ montmoriUonite _+ kaolinite + opal-CT. Miocene strata are slightly altered to totally altered, and adoi:10.1346/ccmn.1990.0380113 fatcat:wyxqrscob5g6jgfnmyuhrtpshm