Acadian Orogeny
A middle Paleozoic deformation, especially in the northern Appalachians; it is named for Acadia, the old French name for the Canadian Maritime Provinces. In Gaspé and adjacent areas the climax of the orogeny can be dated by limiting strata as early in the Late Devonian, but deformational, plutonic, and metamorphic events were prolonged over a more extended period; the last two have been dated radiometrically as between 330 and 360 m.y. ago. The Acadian had best be regarded, not as a single orogenic episode, but as an orogenic era in the sense of Stille.
A middle Paleozoic deformation, especially in the northern Appalachians; it is named for Acadia, the old French name for the Canadian Maritime Provinces. In Gaspé and adjacent areas the climax of the orogeny can be dated by limiting strata as early in the Late Devonian, but deformational, plutonic, and metamorphic events were prolonged over a more extended period; the last two have been dated radiometrically as between 330 and 360 m.y. ago. The Acadian had best be regarded, not as a single orogenic episode, but as an orogenic era in the sense of Stille.