Field evidence strongly suggests that south-central Maine is the locus of a major northeast-trending fault zone. Severe faulting has occurred in the Casco Bay, Bath, and Wiscasset quadrangles as indicated by: (1) the presence of mylonites and other cataclastic rocks; (2) an abrupt change in metamorphic intensity; (3) an offset of metamorphic isograds; and (4) a displacement of the axis of the major structural feature through Wiscasset, an antiform. Crustal movement on this 70-mi-long fault zone probably took place during the late stages of the Acadian orogeny, in Late Devonian time.

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