A previously unrecognized sinistral shear event recently has been identified in Silurian–Devonian rocks of the Millimagassett Lake region, north-central Maine, USA. This event predates the ‘classic’ Early-Mid-Devonian Acadian orogeny of the region, yet affects rocks as young as Early Devonian. The Millimagassett Lake sinistral shear zone places significant time constraints on an early phase of Acadian tectonics that may well extend throughout the northern and Newfoundland Appalachians.

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