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The Bronson Hill Arc is a bimodal volcanic arc and associated sediments that formed over a west (?) dipping subduction zone during the Ordovician period, (ca 475 - 450 Ma) as part of the Taconic Orogeny. These rocks are presently well exposed along the Connecticut River Valley of Vermont and New Hampshire. The arc is evidenced by plutonism and extrusive volcanicsm including the Ammonoosuc Formation (ca. 461 Ma from U/Pb zircon dates) and the overlying Partridge Formation (ca. 457 Ma from graptolites in the Partridge Fm.). It is related the slightly older Shelburne Falls arc that sits to the west. These rocks have been metamorphosed and deformed during the Acadian Orogeny and the Alleghenian Orogeny.

References

Robert H. Moench and John N. Aleinikoff, Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England, Physics and Chemistry of the Earth, Parts A/B/CVolume 27, Issues 1-3, January 2002, Pages 47-95.

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	'''The Bronson Hill Arc''' is a [[Bimodal volcanism\|bimodal volcanic]] arc and associated sediments that formed over an west (?) dipping [[subduction zone]] during the [[Ordovician]] period, (ca 475 - 450 Ma) as part of the [[Taconic Orogeny]]. These rocks are presently well exposed along the [[Connecticut River Valley]] of [[Vermont]] and [[New Hampshire]]. The arc is evidenced by [[plutonism]] and extrusive volcanicsm including the Ammonoosuc Formation (ca. 461 Ma from [[Uranium-lead dating\|U/Pb]] [[zircon]] dates) and the overlying Partridge Formation (ca. 457 Ma from [[graptolite]]s in the Partridge Fm.). It is related the slightly older Shelburne Falls arc that sits to the west. These rocks have been [[Metamorphism\|metamorphosed]] and deformed during the [[Acadian Orogeny]] and the [[Alleghenian Orogeny]].		'''The Bronson Hill Arc''' is a [[Bimodal volcanism\|bimodal volcanic]] arc and associated sediments that formed over a west (?) dipping [[subduction zone]] during the [[Ordovician]] period, (ca 475 - 450 Ma) as part of the [[Taconic Orogeny]]. These rocks are presently well exposed along the [[Connecticut River Valley]] of [[Vermont]] and [[New Hampshire]]. The arc is evidenced by [[plutonism]] and extrusive volcanicsm including the Ammonoosuc Formation (ca. 461 Ma from [[Uranium-lead dating\|U/Pb]] [[zircon]] dates) and the overlying Partridge Formation (ca. 457 Ma from [[graptolite]]s in the Partridge Fm.). It is related the slightly older Shelburne Falls arc that sits to the west. These rocks have been [[Metamorphism\|metamorphosed]] and deformed during the [[Acadian Orogeny]] and the [[Alleghenian Orogeny]].

	==References==		==References==