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The Geology And Structure Of The Canyon Creek-Church Mountain Area, North Cascades, Washington, Jeffrey T. (Jeffrey Thomas) Jones

WWU Graduate School Collection

Four major rock assemblages ranging from Precambrian to Lower Cretaceous occur in the Canyon Creek/Church Mountain area of northwestern Washington. Lithologic, structural, and fossil evidence were used to discriminate among the assemblages and to correlate them with the Chilliwack Group, the Nooksack Group, the Yellow Aster Complex, and a unit previously included in the Chilliwack Group, referred to here as the "chert/basalt unit." These assemblages were juxtaposed during middle Cretaceous tectonism along low angle and high angle faults. There is some evidence for additional structural deformation after the middle Cretaceous.

The Chilliwack Group, consisting of volcanic rocks, volcaniclastic rocks, and …