The Cardigan Pluton was built during what Middle Devonian period?
Cardigan Pluton:  The onset of magmatism was during the Acadian orogeny, and the pluton is part of the Kinsman suite of the New Hampshire Plutonic Series. Acadian orogeny: The Acadian orogeny is a long-lasting mountain building event which began in the Middle Devonian, reaching a climax in the early Late Devonian.
Acadian orogeny