This quartzite, consisting of metamorphosed river and near-shore ocean sediment—mainly sand—deposited … Intrudes CAbw and PZZc (?). Conglomerate, sandstone, siltstone, argillite, and melaphyre. Boston public radio and television stations WGBH-FM-TV take their call letters from Great Blue Hill, which was the original location of the station's FM and TV transmitters. Light-gray to grayish-pink, biotite granite, locally foliated. Includes rock mapped formerly as Bellingham Conglomerate. Bellingham Conglomerate consists of conglomerate and lithic graywacke interbedded with chlorite phyllite and is confined to Bellingham basin. Over time, … Milton, Stoughton, Holbrook, etc. Consists of Brookline, Dorchester, and Squantum Members. The Blue Hills is an exposed region of volcanic rocks where there had been a volcano active 440 million years ago. M/T/W: 1PM-9PM. Search for Massachusetts topo maps: Blue Hills Topographic Map. Preliminary report on the geology of the Blue Hills quadrangle, Massachusetts by Chute, Newton Earl, 1940 edition, in English Mattapan Volcanic Complex is found in west and southwest part of Boston basin and beyond, and to the south in Blue Hills. A somewhat questionable Rb/Sr whole-rock age of 579 +/-28 Ma (Fairbairn and others, 1967) obtained from Westwood indicates it may be younger than Dedham and may be about same age as Mattapan (Wones and Goldsmith, 1991). Blue Hills Ski Area Hours. Red to pink, well-sorted conglomerate, graywacke, sandstone, and shale; fossil plants. Equivalent to Plainfield Formation of eastern CT because it lies in same strike belt, and is probably equivalent to Quinnville Quartzite and unnamed mica schist and phyllite of Blackstone Group. Dorchester Member consists of interbedded argillite and sandstone and forms an intermediate unit between Brookline Member and overlying Cambridge Argillite. AAPG geologic province: New England province* Near Sharon, unit is intruded by unnamed Proterozoic Z diorite (Wones and Goldsmith, 1991). Les Tyrala of Quincy is a registered geologist who leads popular walks in the Blue Hills Reservation and at World’s End in Hingham, among other places. Mafic phase. BLUE HILLS RESERVATION . indicates that Cambridge and Braintree Argillites are identical. United States Department of The Interior Geological Survey . Contact, chat, social media. Also contains rhyolite and basalt horizons near Attleboro. Preliminary report on the geology of the Blue Hills quadrangle, Massachusetts by Chute, Newton Earl, unknown edition, The volcanic rocks of the Blue Hills area of Massachusetts, referred to in the earlier literature as “aporhyolites,” have been divided informally into six units on the basis of textural and compositional features and stratigraphic position. Dept. Fossil plants. SHIP IN USA ONLY . Some rocks resembling Westwood, such as those exposed in Plymouth quarries near Weymouth, have been mapped as part of Dedham Granite on MA State Geologic Map (Zen and others, 1983). 4001 Washington Street. No clasts of Quincy observed in Early Pennsylvanian Pondville Conglomerate, but clasts of overlying and probably related Blue Hills Granite Porphyry are common in Pondville. Age of deposits in Narragansett and Norfolk basins ranges from Early to Late Pennsylvanian; however, Skehan and Murray (1980) assigned lower part of Pondville to Mississippian. The two rock units have been traditionally distinguished in the past by presence or absence of epidote (Warren and Powers, 1914), but this needs further study. Preliminary report on the geology of the Blue Hills quadrangle, Massachusetts This edition published in 1940 in Boston, Mass. It is the highest point in Norfolk County and the Greater Boston area. natural fabric of forest and ponds, hilltops and wetlands. Blue Hills Map (MA) To zoom in, click on the map to the right. Geologic unit mapped in Massachusetts: Microperthite-quartz porphyry. Sandstone, graywacke, shale and conglomerate; minor beds of meta-anthracite. Divided into Brookline, Dorchester, and Squantum Members. Blue Hills Quadrangle, Massachusetts Compiled by Byron D. Stone and Mary L. DiGiacomo-Cohen Map was scanned, processed, georeferenced, rectified, and cropped by the Massachusetts Geological Survey Map units were modified from Chute (1965a). The mass near Woonsocket was thought at the time of compilation of the MA State geologic map (Zen and others, 1983) to be same general age as granite at Quincy. And it also has the ability to automatically download and display complete, high-resolution scans of every USGS topo map … Dedham North Granite has a compositionally highly variable suite ranging from leucogranites to granodiorites, tonalites, and quartz diorite. The geology of the Boston Basin and its borders is complicated involving colliding continents, exotic terranes, mountain building, volcanoes, earthquakes, weathering, vaulting, erosion, deposition and glaciers. Northwest of Attleboro, Wamsutta overlies Diamond Hill Felsite as used by Skehan and Murray (in Skehan and others, 1979). The hills are composed of erosion-resistant red quartzite that is topped with a thin layer of glacial deposits. … Mafic minerals less prominent than in Milford Granite but granular quartz common. Conglomerate contains pebbles of quartzite from adjacent Blackstone Group rocks and typical blue quartz of Milford Granite, so sediments are locally derived. Isotopic age of 630 +/-15 Ma was determined using U-Pb methods on zircon by Zartman and Naylor (1984). LaForge (19832) cautioned against identifying rocks interbedded within Mattapan that look like Roxbury, but are still part of Mattapan. Rising above the horizon, Great Blue Hill reaches a height of 635 feet, the highest of the 22 hills in the Blue Hills chain. The stories the rocks tell include vanished continents, ancient volcanoes, and … The Blue Hills are nothing short of an archaeological wonder of epic proportions. Preview of 1960 edition USGS topo map Blue Hills, Massachusetts . Intrudes Zdi, Zgb, Zb, Zv. Further study may reveal even older Paleozoic sediments in Narragansett basin (Goldsmith, 1991). Intruded by Proterozoic Z batholithic rocks. Core analysis by D.A. Both units are reported to lie nonconformably on Dedham Granite and unnamed plutonic-volcanic complex of eastern MA; however, Mattapan has been observed as dikes and stocks cutting Dedham Granite (Billings, 1976; Kaye and Zartman, 1980; Chute, 1966), and other workers have pointed out evidence that some of Mattapan may be penecontemporaneous with younger phases of Dedham batholith. Blue Hills Volcano: The Blue Hills Reservation sits on top of an ancient Volcano. The history of Blue Hills is significant and has played a part in American history for almost four hundred years. Similar in lithology to Lynn Volcanic Complex. 2. WGBH-TV moved its antenna to a taller tower in Needham in the 1960s. Proterozoic Z age is based on U-Th-Pb zircon date of 602 +/-3 Ma (Zartman, in Kaye and Zartman, 1980). Demonstrating tin processing techniques. Age is uncertain. Quartzite, schist, calc-silicate quartzite, and amphibolite. Title: Bedrock geologic map of the Blue Hills quadrangle, Norfolk, Suffolk, and Plymouth Counties, Massachusetts Author(s): Chute, N.E. Eventually this volcano erupted and collapsed, and the magma chamber slowly cooled. Home > Our Geology > Blue Hills mine Blue Hills mine Posted on May 1st 2004. Red and green shales may actually be Cambrian. Wamsutta Formation occurs in Narragansett and Norfolk basins. Blue Hills Quadrangle, Massachusetts Compiled by Byron D. Stone and Mary L. DiGiacomo-Cohen Map was scanned, processed, georeferenced, rectified, and cropped by the Massachusetts Geological Survey Map units were modified from Chute (1965a). Red and gray metamorphosed conglomerate, sandstone, graywacke, and shale. Remnants of this erosion surface may be repre­ sented by the tops of the higher hills in the northwestern and southern parts of the quadrangle. View adjacent maps. From the Eliot Tower at the summit, the city of Boston and many of the surrounding hills of the Milton and Canton area are visible. Described as dark gray to dark blue, weathering buff brown to salmon. Geologic unit mapped in Massachusetts: Microperthite-quartz porphyry. Contact between Westboro and Blackstone is arbitrary on State bedrock map on basis of proximity of isolated exposures of the two units to their respective type areas. Although Billings (1979) questions reliability of zircon ages from volcanic rocks, discovery of Proterozoic Z acritarchs in overlying Cambridge Argillite indicates zircon age is appropriate (Goldsmith, 1991). Author follows usage of Chute (1966) who could find no difference between volcanic rocks in Blue Hills area and Mattapan rocks, and thus these rocks are assigned to Mattapan. General Information. Upper member of Pondville Conglomerate grades into and interfingers with Wamsutta; in turn, Wamsutta interfingers with Rhode Island Formation in northwest part of Narragansett basin. Consists of conglomerate, lithic graywacke, sandstone, and shale. Both units consist largely of partly porphyritic rhyolite and rhyodacite flows, welded ash-flow tuffs, vitric tuff, lapilli tuff, lithic tuff, flow breccias, breccia pipes, and extrusion domes. Great Blue Hill, and the Blue Hills Reservation in general, is a popular hiking destination, valued as much for its splendid trails and views as for its proximity to the metropolitan area. Blue Hills Ski Area. Proterozoic Z age is based on U-Th-Pb zircon date of 602 +/-3 Ma (Zartman, in Kaye and Zartman, 1980). Age is Middle and Late Pennsylvanian (Goldsmith, 1991). Hornblende gabbro and hornblende-pyroxene gabbro metamorphosed in part to hornblende gneiss and amphibolite. TH/FR: 10AM-9PM. In deference to tradition, and because Proterozoic Z age has not been proven, age is shown on MA State bedrock map of Zen and others as Proterozoic Z to Pennsylvanian [map actually has age of Proterozoic Z, Cambrian, or Pennsylvanian, which differs from age stated in this report.] INTRODUCTION. Publication Date 1941 Start Date 1936 End Date 1948 File Modification Date 2018-08-01 06:23:00. They also resemble Proterozoic Z Mattapan Volcanic Complex. Occupies an area of about 100 sq km. This could be an opportunity to discuss the different types of igneous rocks, such as granite … In 1614, Capt. The Hard Truth: The Geology of the Blue Hills (PDF), "...Within the western part of the Reservation, the magma cooled more rapidly giving the minerals lesser time to crystallize. The area once attracted quarrying for its "blue granite". This volcano was active around 440 million years ago. The soils most commonly associated with these deposits are Charlton, Paxton, and Montauk soils. Geologic units in Massachusetts (state in United States) Granite, gneiss, and schist, undivided (Proterozoic Z) at surface, covers 9 % of this area Plutonic and metamorphic rocks of probable Proterozoic Z age. Conglomerate in Brookline Member contains clasts of Dedham Granite, quartzite (possibly from Westboro Formation), and volcanic rock from underlying Mattapan Volcanic Complex. Red to gray to green polymict conglomerate, sandstone, and shale. Those to the north of Boston and studied in this report, are referred to as Dedham North. Massachusetts BLUE HILLS QUADRANGLE . The hills … Rocks mapped as Rice Gneiss by Nelson (1974) were included in unnamed metamorphosed mafic and felsic volcanic unit on State bedrock map, but author now feels it should be either a part of Westboro, or a separate unit below it. Some units were mapped or revised from recent field studies and from analysis of topographic (lidar) data … Locked in the rocks of Great Blue Hill is evidence of a surprising amount of geological activity. 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. Since the time of first … Assigned a Late Ordovician and Early Silurian age because of its close similarity, both chemically and mineralogically, to … Blue Hills Reservation is a 6,000-acre (2,400 ha) state park in Norfolk County, Massachusetts.Managed by the Massachusetts Department of Conservation and Recreation, it covers parts of Milton, Quincy, Braintree, Canton, Randolph, and Dedham.Located approximately ten miles south of downtown Boston, the reservation is one of the largest parcels of … Occurs within Dedham batholith. Melaphyre in the Roxbury Conglomerate. Milton, Stoughton, Holbrook, etc. Managed by the Massachusetts Department of Conservation and Recreation, it covers parts of Milton, Quincy, Braintree, Canton, Randolph, and Dedham. U.S. Geological Survey, 1941, USGS 1:31680-scale Quadrangle for Blue Hills, MA 1941: U.S. Geological … Contains a few plant fossils (Goldsmith, 1991). Utilizing the documents previously published regarding the location of outcrops of blue hills rhyolite, Braintree slate, and Massachusett hornfels, we sought out … Sharon syenite, … GEOLOGY OF MASSACHUSETTS Patrick J. Barosh, P.J. Great Blue Hill, also known as Massachusett, is a hill of 635 feet (194 m) located within the Blue Hills Reservation in Milton and Canton, Massachusetts, about 10 miles (16 km) southwest of downtown Boston. The geology of Massachusetts includes numerous units of volcanic, intrusive igneous, metamorphic and sedimentary rocks formed within the last 1.2 billion years. Volume 81, Number 12 Ordovician cauldron subsidence of the Blue Hills Complex, eastern Massachusetts MARLAND P. BILLINGS . Partly equivalent to Rhode Island Formation. The park's varied terrain and scenic views mak… Red and green shales may actually be Cambrian. The Reservation has modest water resources only ; 994 acres (i.e., 17.2% of the Reservation) are wetlands or ponds. Quincy Granite intrudes Middle Cambrian Braintree Argillite. Dates on two samples from Sheffield Heights indicate that the diorite and granite are part of the Dedham North suite. This item will ship to United States, but the seller has not specified shipping options. Interim digital compilation of the published surficial geology of the Assawompsett Pond, Blue Hills, Bridgewater, Brockton, Duxbury, Hanover, Scituate, Norwood, Taunton, and Whitman 7.5' quadrangles.This will be superseded by the publication of … Variably metamorphosed. A network of streams, … Westwood Granite may be intrusive equivalent of Mattapan. 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