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Journal of the Geological Society; 1993; v. 150; issue.5; p. 815-818;
DOI: 10.1144/gsjgs.150.5.0815
© 1993 Geological Society of London

Specials

Early Acadian sinistral shear in north-central Maine, USA

J. HIBBARD & S. HALL

Department of Marine, Earth and Atmospheric Sciences, Box 8208, North Carolina State University, Raleigh, NC 27695, USA

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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