A steeply plunging syncline in a Precambrian quartzite in the Medicine Bow Mountains, Wyoming, is bordered by a major zone of dislocation. The quartzite is a relatively young unit of a crystalline-metasedimentary complex forming the core of the range. Consideration of the geometry of the folded layering, contained lineations, and the quartz microfabrics indicates that the folding was flexural and that it was superposed on an earlier fold system. Spatial relationships suggest that the fold and the zone of dislocation are related in time of formation.

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