The Cardigan Pluton is the most voluminous pluton in the state of New Hampshire, United States.
 The onset of magmatism was during the Acadian orogeny, and the pluton is part of the Kinsman suite of the New Hampshire Plutonic Series.
 The pluton is approximately 20 km wide by 90 km long and on average about 2.5 km thick.
 It is exposed in west-central New Hampshire along a north-northeast by south-southwest axis, extending from the town of Groton in the north to Dublin in the south.
 Mount Cardigan, from which the pluton is named, stands near the north end.
Adam Sedgwick (22 March 1785 – 27 January 1873) was a British geologist, one of the founders of modern geology.
 He proposed the Devonian period of the geological timescale.
 Based on work which he did on Welsh rock strata, he proposed the Cambrian period in 1835, in a joint publication in which Roderick Murchison also proposed the Silurian period.
 Later in 1840, to resolve what later became known as the Great Devonian Controversy about rocks near the boundary between the Silurian and Carboniferous periods, he and Murchison proposed the Devonian period.
Kolpaspis is an extinct genus of placoderm fish, which lived during the Middle Devonian period of North America.
The A’ermantie Formation is located in the Xinjiang Uygur Autonomous Region and is dated to the middle Devonian period.
Cartieraspis is an extinct genus of placoderm fish, which lived during the Middle Devonian period in North America.
The Acadian orogeny is a long-lasting mountain building event which began in the Middle Devonian, reaching a climax in the early Late Devonian.
 It was active for approximately 50 million years, beginning roughly around 375 million years ago, with deformational, plutonic, and metamorphic events extending into the Early Mississippian.
 The Acadian orogeny is the third of the four orogenies that created the Appalachian orogen and subsequent basin.
 The preceding orogenies consisted of the Potomac and Taconic orogeny, which followed a rift/drift stage in the Late Neoproterozoic.
 The Acadian orogeny involved the collision of a series of Avalonian continental fragments with the Laurasian continent.
 Geographically, the Acadian orogen extended from the Canadian Maritime provinces migrating in a southwesterly direction toward Alabama.
 However, the Northern Appalachian region, from New England northeastward into Gaspé region of Canada, was the most greatly affected region by the collision.
The Late Devonian extinction was one of five major extinction events in the history of the Earth's biota.
 A major extinction, the Kellwasser event, occurred at the boundary that marks the beginning of the last phase of the Devonian period, the Famennian faunal stage (the Frasnian–Famennian boundary), about 375–360 million years ago.
 Overall, 19% of all families and 50% of all genera became extinct.
 A second, distinct mass extinction, the Hangenberg event, closed the Devonian period.
Luckeus is a genus of prehistoric lobe-finned fish.
 "Luckeus" belonged to the group of onychodontid fishes.
 It lived during the Early Devonian to Middle Devonian period (Emsian to Eifelian faunal stages) in central Australia.
Huginaspis is an extinct genus of placoderm fish, which lived during the Middle Devonian period of Spitsbergen, Norway.
Aneurophyton is a genus of extinct vascular plants that belong to the Aneurophytales, a class of progymnosperms.
 The genus is primarily known from records of two well-known species found in mostly Middle Devonian and Upper Devonian (late Eifelian to Famennian) outcrops in Belgium, China (West Junggar), Germany, and the United States (New York).
 Some uncertain species within the genus are also recorded from Middle Devonian outcrops in Kazakhstan, Russia (Timan and Siberia), and the Ukraine.
 While a number of species have been described in the paleobotanical literature, the genus likely only contains two well-circumscribed species, "A. germanicum" and "A. doui", and possibly a third species, "A. olnense", from Fammenian outcrops in Belgium.
 If the ages of the Early Devonian (Emsian) records of "A. germanicum" reported from Siberia are confirmed, these would constitute the oldest records of this genus.

Question: The Cardigan Pluton was built during what Middle Devonian period?
Answer: Acadian orogeny