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Dedham Granite
Dedham Granite is a light grayish-pink to greenish-gray, equigranular to slightly porphyritic, variably altered, granite south and west of Boston, named for the town of Dedham, Massachusetts. Qualities Dedham Granite includes dioritic rock near Scituate and Cohasset and Barefoot Hills Quartz Monzonite. Intrudes Zdi, Zgb, Zb, Zv. Extensive calc-alkaline plutons separated by Boston basin have long been mapped as Dedham. Those to the north of Boston and studied by the US Geological Survey, are referred to as Dedham North. Crystallization ages for the Dedham North suite (based on titanites and zircons) have been determined at 607+/-4 Ma, while ages for the Lynn are slightly younger at 596+/-3 Ma. Both are clearly part of the Late Proterozoic magmatic event. Dates on two samples from Sheffield Heights indicate that the diorite and granite are part of the Dedham North suite. The Dedham south and west of Boston has been dated at 630+/15 Ma. Dedham North Granite has a compositionally highl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite
Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or ''granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. Granite is nearly alway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diorite
Diorite ( ) is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica ( felsic) granite. Diorite is found in mountain-building belts (''orogens'') on the margins of continents. It has the same composition as the fine-grained volcanic rock, andesite, which is also common in orogens. Diorite has been used since prehistoric times as decorative stone. It was used by the Akkadian Empire of Sargon of Akkad for funerary sculptures, and by many later civilizations for sculptures and building stone. Description Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and sometimes pyroxene. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic grani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz Monzonite
Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite. A rock with more alkali feldspar is a syenite whereas one with more plagioclase is a quartz diorite.Classification of Igneous Rocks The fine grained |
United States Of America
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dedham, Massachusetts
Dedham ( ) is a town in and the county seat of Norfolk County, Massachusetts, United States. The population was 25,364 at the 2020 census. It is located on Boston's southwest border. On the northwest it is bordered by Needham, on the southwest by Westwood, and on the southeast by Canton. The town was first settled by European colonists in 1635. History Settled in 1635 by people from Roxbury and Watertown, Dedham was incorporated in 1636. It became the county seat of Norfolk County when the county was formed from parts of Suffolk County on March 26, 1793. When the Town was originally incorporated, the residents wanted to name it "Contentment." The Massachusetts General Court overruled them and named the town after Dedham, Essex in England, where some of the original inhabitants were born. The boundaries of the town at the time stretched to the Rhode Island border. At the first public meeting on August 15, 1636, eighteen men signed the town covenant. They swore that they wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Memorial Hall (Dedham, Massachusetts)
Memorial Hall served as both the town hall of Dedham, Massachusetts from 1868 until 1962 and as the Town's monument to the soldiers from the town who died in the Civil War. Background After nearly 200 years of Town government, the Town Meeting decided to build a town hall on Bullard Street in 1828. By 1858, however, a town committee was complaining that "the present town house is neither in location, size, or style, sufficient to meet the reasonable requirements of the town." It was too far away from the center village and too ugly they said, and though there were over 1,000 voters in the town the building could not accommodate more than 275. Town meetings were frequently crowded and confused in the townhouse, and it was difficult to hear speakers and determine votes. Before the Civil War had even ended, residents were considering the best way to honor those who had faught and died in the war. On May 7, 1866, Town Meeting voted to build a new town hall, to be built of Dedham Gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dedham Station
Dedham (formerly Dedham Center) was a train station located in central Dedham, Massachusetts, at the terminus of the Dedham Branch. Original station The original Dedham station stood near the intersection of Eastern Avenue and High Streets. It opened in February 1835 with the rest of the Dedham Branch. The depot bell was mounted on a tall post at the northeast corner on a projecting gooseneck arm. It was rung 10 minutes before a train was to leave, then again five minutes before, and for a final time at the train's departure. It burned down in 1849, leaving only the walls standing, and it was patched up with boards for temporary use until a new station could be constructed to the south. New station The station had a long colonnade of arches facing Eastern Avenue and it had a bell tower. A red covered bridge would rumble as trains would pass through it. After April 1966, Dedham station, along with the rest of the Dedham Branch, was part of the MBTA Commuter Rail The MBTA Commut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dedham Public Library
The Dedham Public Library is a public library system established in 1872. It is part of the Minuteman Library Network. History Social library In 1794, just four years after the first circulating library was established in Massachusetts, the First Church and Parish in Dedham organized a social library. The minister, Jason Haven, kept the books in his house and they were only circulated on Mondays. The books were eventually moved to the vestry of the church, and circulation was moved to Sundays. Dedham Library Association On the November 24, 1854, a social library was organized in Dedham under the general laws by the name of the Dedham Library Association. The impetus for the founding the Library Association was Carlos Slafter, who made the first suggestion, and Dr. Joseph P. Paine. The pair raised $1,300. A circulating library belonging to Elbridge G. Robinson, editor of the Norfolk Democrat, was purchased for about $200. In addition to these, many new books were bought at an expen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trinity Church (Boston)
Trinity Church in the City of Boston, located in the Back Bay neighborhood of Boston, Massachusetts is a parish of the Episcopal Diocese of Massachusetts. The congregation, currently standing at approximately 4,000 households, was founded in 1733. Five services are offered each Sunday, and weekday services are offered three times a week from September through June. Within the spectrum of worship styles in the Anglican tradition, Trinity Church has historically been considered a Broad Church parish. In addition to worship, the parish is actively involved in service to the community, pastoral care, programs for children and teenagers, and Christian education for all ages. The church is home to several high-level choirs, including the Trinity Choir, Trinity Schola, Trinity Choristers, and Trinity Chamber Choir. The building, designed by Henry Hobson Richardson, is currently under study for becoming a Boston Landmark.https://www.cityofboston.gov/images_documents/PETSTATS_June2016_t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plymouth Rock
Plymouth Rock is the traditional site of disembarkation of William Bradford and the ''Mayflower'' Pilgrims who founded Plymouth Colony in December 1620. The Pilgrims did not refer to Plymouth Rock in any of their writings; the first known written reference to the rock dates to 1715 when it was described in the town boundary records as "a great rock." The first documented claim that Plymouth Rock was the landing place of the Pilgrims was made by 94-year-old Thomas Faunce in 1741, 121 years after the Pilgrims arrived in Plymouth. In 1774, the rock broke in half during an attempt to haul it to Town Square in Plymouth. One portion remained in Town Square and was moved to Pilgrim Hall Museum in 1834. It was rejoined with the other portion of the rock, which was still at its original site on the shore of Plymouth Harbor, in 1880. The date 1620 was inscribed at that time. The rock is now ensconced beneath a granite canopy. History Early identification The two most significant primary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
