Shared characteristics including parental rock types, lithologic associations, isoclinal folding accompanied by greenschist to lower amphibolite facies metamorphism, parallel structural trends, and Devonian metamorphic age support a correlation between metamorphic rock units previously assigned to the Duzel Formation (“Eastern Klamath belt”) and Grouse Ridge Formation (Central Metamorphic belt) in northern California. Contact relations and mineral assemblages suggest that Devonian metamorphism and deformation occurred during juxtaposition of the Central Metamorphic belt and ultramafic rocks from the Trinity mafic-ultramafic complex, perhaps during eastward subduction. Ages and contact relations of two unmetamorphosed Eastern Klamath belt units (the Gazelle Formation and the Moffett Creek Formation) suggest that these units were faulted into their present positions subsequent to the Devonian metamorphic event.

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