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Between 620 and 610 million years ago (rocks of these ages are southwest and north of Boston respectively) the Dedham granite intruded, contributing foliation in the Burlington mylonite and thin layers of feldspar and recrystallized quartz, while the Westwood granite developed at shallow depth and intruded the Mattapan volcanic rocks.
The Roxbury Conglomerate is underlain by circa 610 Ma Dedham Granite and circa 599 Ma Westwood Granite. It also overlies circa 596 Ma Mattapan Volcanic Complex. The Roxbury Conglomerate interfingers with upper part of the Brighton Volcanic rocks (c. 580–650 Ma).
W.N. Flynt Granite Co., in Monson, Massachusetts, a granite quarry that opened in 1809 and operated until 1935. By 1888, the company employed over 200 workers, and produced about 30,000 tons of granite per year. Quincy Quarries Reservation, in Quincy, Massachusetts, producer of granite from 1826 to 1963, including for the Bunker Hill Monument.
Westwood was first settled in 1641 and was part of the town of Dedham, originally called 'West Dedham', until it was officially incorporated in 1897. It was the last town to split from the original town of Dedham. From early in the settlement of Dedham, the people of the Clapboard Trees Precinct were "a wealthy, sophisticated lot, familiar with ...
The Dedham granite was formed during the Ediacaran Period of the Precambrian era about 610 million years ago and is one of the oldest rocks in the Boston basin. [2] Dedham granites to the south and west of the basin are older outcrops from around 630 million years ago, while outcrops to the north of the basin are younger and closer to 596 million years old. [2]
Added to NRHP. January 17, 2002. The Graniteville Historic District of Westford, Massachusetts, United States, encompasses one of the town's historic 19th century industrial villages. The area was, until the arrival of the railroad in 1847, primarily known for its granite quarries. The railroad's arrival prompted the construction of an ...
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