The Grand Canyon of the Colorado offers excellent conditions for study of the relations between systematic jointing in Precambrian metamorphics and in overlying sedimentary rocks. A brief, preliminary investigation of jointing was made in the Bright Angel section of the canyon in August, 1956.

In this area, a southwest-dipping structural slope is interrupted by monoclinal folds trending northwest and by the Bright Angel and Cremation faults (Fig. 1). The Bright Angel fault strikes northeast along Bright Angel and Garden canyons and follows closely the direction of schistosity in the Archean metamorphics. Two periods of movement are recognized along...

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