M/T/W: 1PM-9PM. Age of mass at Woonsocket has been more recently determined to be Devonian or possibly Carboniferous, rather than Late Ordovician and Silurian (Hermes and Zartman (1985) (Wones and Goldsmith, 1991). Argillite, some with rare limestone; contains Middle and Early Cambrian faunae respectively. The Blue Hills rise about 600 feet above the landscape of northwestern Rusk, southwestern Sawyer, and northeastern Barron Counties. Mattapan's rhyolite and rhyodacites are thinner and less varied in composition and texture than Lynn's, and volcanic breccias are absent in Lynn. Bounded by Quincy Granite to the north and east, and by Neponset fault on the west; unconformably overlain by Pondville Conglomerate to the south (Wones and Goldsmith, 1991). 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. There is also alpine skiing available at Blue Hills Ski Area, consisting of eight trails served by a double chair and two surface lifts. Contact Us. … In 2012, I set out on a day-long hike in the Blue Hills Reservation with my wife, Jen, who is also an archaeologist. Mafic phase. ExpertGPS mapping software includes seamless topo map coverage for the entire United States. Age is Middle and Late Pennsylvanian (Goldsmith, 1991). Red and gray metamorphosed conglomerate, sandstone, graywacke, and shale. Brighton Melaphyre lies within Brookline Member and consists of mafic volcanic rocks (quartz keratophyre, keratophyre, and spilite). Digital topo map DVD and paper map purchase of the Blue Hills USGS topo quad at 1:25,000 scale. Topo Map Name: Blue Hills USGS Topo Quad ID: 42071b1 SE Coordinates: 42.125° N latitude / 71° W longitude U.S. State: MA: Filename: k42071b1.jpg Map Type: Topographic Topo Series: 7.5´x15´ Map Scale: 1:25,000: … [Used mistakenly as Blue Hills Granite Porphyry; the plural Hills was not intended and should not be used.] 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. Consists of Brookline, Dorchester, and Squantum Members. Southern contact is with chemically and mineralogically similar Blue Hills Granite Porphyry. Also contains rhyolite and basalt horizons near Attleboro. Includes mafic-poor granite similar to Zhg. Gray to dark-gray syenite containing microperthite, oligoclase and clinopyroxene, mixed with ferro-gabbro. Northwest of Attleboro, Wamsutta overlies Diamond Hill Felsite as used by Skehan and Murray (in Skehan and others, 1979). Combined area of Quincy and Blue Hills rocks is 55 sq km. Age of Cambridge and of Boston Bay Group as a whole is Proterozoic Z and possibly Early Cambrian based on presence of acritarchs in Cambridge. Pondville Conglomerate is present in Narragansett and Norfolk basins. The two sections of the Reservation appear to have formed from the same body of emplaced magma, which means that they share the same mix of minerals. View adjacent maps. From the rocky summit visitors can see over … 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. Quartzite, argillite, and minor limestone; contains Middle Cambrian fauna. Similar in lithology to Lynn Volcanic Complex. A relatively level hike through majestic stands of pines and hemlocks. South of town of Westborough, Westboro is truncated by Bloody Bluff-Lake Char fault system. Red beds lie above cleaner quartzites such as Tufts and Milton units. Geologic unit mapped in Massachusetts: Microperthite-quartz porphyry. The modern name for the hill was given by early European explorers who, while sailing along the coastline, noticed the bluish hue of the exposed granite faces when viewed from a distance (due to Riebeckite). The Great Dome Trail flow is the oldest, followed by the Wampatuck Hill flow, Chickatawbut Road flow, and the pyritic volcanic rocks. Utilizing the documents previously published regarding the location of outcrops of blue hills rhyolite, Braintree slate, and Massachusett hornfels, we sought out … The stories the rocks tell include vanished continents, ancient volcanoes, and … 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 … Geologic unit mapped in Massachusetts: Microperthite-quartz porphyry. Nonconformably overlies Dedham Granite. 2. Metavolcanic rocks in Blue Hills resembling Mattapan are assigned to Mattapan on State bedrock map (Zen and others, 1983); for years they were considered to be either Silurian and Devonian, or Carboniferous; however, they are chemically and mineralogically distinct from Ordovician and Silurian Blue Hills [sic] Granite Porphyry. Contact the seller- opens in a new … at on the Surficial Geology Map shows that the hills have a veneer of glacial till. 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. MARLAND P. BILLINGS 1. Intrudes CAbw and PZZc (?). SHIP IN USA ONLY . Eventually this volcano erupted and collapsed, and the magma chamber slowly cooled. Red to gray to green polymict conglomerate, sandstone, and shale. Barosh and Associates, 103 Aaron Ave., Bristol, RI 02809 Bradford A. Miller, P.G., Haley & Aldrich, Inc., 465 Medford St., Suite 2200, Boston, MA 02129 INTRODUCTION Massachusetts displays some of the most fascinating geology in the country and has a long and rich history of research. Those to the north of Boston and studied in this report, are referred to as Dedham North. Small mass of "Quincy Granite" east of Woonsocket, RI, near RI-MA border is similar in texture to Quincy Granite at Quincy, MA, but is more peralkaline. Gray, seriate to sub-porphyritic granite to granodiorite, mafic minerals tend to be in clots; locally gneissic. Contains acritarchs. And it also has the ability to automatically download and display complete, high-resolution scans of every USGS topo map … The Blue Hills are bounded on the north by a high angle reverse fault. Dorchester Member consists of interbedded argillite and sandstone and forms an intermediate unit between Brookline Member and overlying Cambridge Argillite. For this reason, American meteorologist Abbott Lawrence Rotch chose Great Blue Hill as the site for an observatory, which became known as the Blue Hill Meteorological Observatory after its completion in 1885. Shipping and handling. [3], The name of the Massachusett Indian tribe and their language (and thus the name of the Bay, Colony, Commonwealth/State, etc.) This is supported by observation that Bellingham is a structural trough extending southwest from Boston basin and separating primarily Proterozoic Z granitoids from altered, but nongneissic, Proterozoic granitoids (Wones and Goldsmith, 1991). Age is Early and Middle Pennsylvanian. Preliminary report on the geology of the Blue Hills quadrangle, Massachusetts by Chute, Newton Earl, unknown edition, Extensive intrusion breccias occur at contacts of Westwood with older mafic rocks. Skehan and others (1979) suggest that Bellingham may have a similar age to that of Roxbury. These are shown within Wamsutta Formation on MA State bedrock map of Zen and others (1983) because of their proximity to Diamond Hill. In disagreement separates the basin from the blue hills in the North-East, where it narrows. Proterozoic Z age is based on U-Th-Pb zircon date of 602 +/-3 Ma (Zartman, in Kaye and Zartman, 1980). Shipping and handling. The lava from the original volcano formed massive formations of stone across the Blue Hills ranging in size from large boulders to entire mountains. No reports of cobbles of Westwood within Roxbury Conglomerate; therefore, it is possible that Westwood is intrusive equivalent of Mattapan Complex that underlies Roxbury and that Westwood was not exposed to erosion at time of deposition of Roxbury. 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. Occupies an area of about 100 sq km. At head of title: Commonwealth of Massachusetts. Light-gray to pinkish-gray, fine- to medium-grained granite. Consists of conglomerate, lithic graywacke, sandstone, 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. [5] WKAF, an FM station licensed to Brockton, moved its transmitter northward from near Brockton to Great Blue Hill in 2005 to better serve Boston. More than 120 miles of trails weave through the natural fabric of forest and ponds, hilltops and wetlands. Includes isolated quartzite masses mapped by Castle (1964) in Reading area. Blue Hills Reservation - teacher guide. (Южный Норфолк Бассейн) Acidic volcanic rocks of the flanks of the basin in the South-West and it is fragmented into many small flaws. Microperthite-quartz porphyry. Download this stock image: Massachusetts USGS Historical Topo Map MA Blue Hills 350025 1958 24000 Inverted Restoration - W4YBP2 from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Dept. The name Blue Hills [sic] Granite Porphyry is retained although it has been used as Blue Hills Porphyry by Naylor and Sayer (1980); they believe it to be same age as Quincy Granite which Zartman and Marvin (1971) and Zartman (1977) have dated with Cape Ann Complex as Late Ordovician or Early Silurian. LaForge (19832) cautioned against identifying rocks interbedded within Mattapan that look like Roxbury, but are still part of Mattapan. Roxbury clearly lies nonconformably on Dedham Granite near Hull, MA; can be traced continuously over Mattapan Volcanic Complex. In places overlies Dedham Granite. With the tearing apart of our "stone pages" and up-and- down and cross-movements called faults, our section of the Blue Hills Complex is indeed complex enough, being reversed in its order of layers or strata in the most important places. Turn right and follow the path past intersection #1178, and then turn left bac… Milton, Stoughton, Holbrook, etc. The geology of Massachusetts includes numerous units of volcanic, intrusive igneous, metamorphic and sedimentary rocks formed within the last 1.2 billion years. Dedham North Granite has a compositionally highly variable suite ranging from leucogranites to granodiorites, tonalites, and quartz diorite. 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. Red to pink, well-sorted conglomerate, graywacke, sandstone, and shale; fossil plants. [8][9], Great Blue Hill and the Blue Hills Reservation is the last remaining area in Greater Boston where the timber rattlesnake and copperhead can be found. There is one tin producer remaining in Cornwall! Intruded by Proterozoic Z batholithic rocks. "Blue Hills of Massachusetts", written by Katherine E. Mullen of Barre, was designated the official poem of the Commonwealth of Massachusetts by the Massachusetts … Partly equivalent to Rhode Island Formation. GEOLOGY OF SELECTED QUADRANGLES IN MASSACHUSETTS GEOLOGY OF THE NORWOOD QUADRANGLE, NORFOLK AND SUFFOLK COUNTIES, MASSACHUSETTS By NEWTON E. CHUTE ABSTRACT The Norwood 7%-minute quadrangle, an area of about 55 square miles, south­ west of Boston, Mass., has moderate relief and is drained mainly by the … Further study may reveal even older Paleozoic sediments in Narragansett basin (Goldsmith, 1991). Although Chute (1964, 1966, 1969) recognized a lower boulder conglomerate member and an upper sandstone to pebble conglomerate member in the Pondville in the northeast part of the basin, such a division is not readily made to the southwest because of facies changes. The Pondville conglomerate, lying on the blue Hill Granite porphyry dips 60 degrees South. Westboro as portrayed by Nelson (1974), Bell and Alvord (1976), and Hepburn and DiNitto (1978) are correlative [with varying certainty]. Locked in the rocks of Great Blue Hill is evidence of a surprising amount of geological activity. Small mass of "Quincy Granite" east of Woonsocket, RI, near RI-MA border is similar in texture to Quincy Granite at Quincy, MA, but is more peralkaline. [12], The South Bay interchange (looking south) to the Southeast Expressway with Great Blue Hill visible in the background, Large hill near Boston, Massachusetts, United States, Massachusetts Department of Conservation and Recreation, "TV station fires producer for airing April-fool prank", http://www.mass.gov/eea/docs/dfg/nhesp/species-and-conservation/nhfacts/crotalus-horridus.pdf, http://www.boston.com/yourtown/quincy/articles/2012/07/01/one_of_massachusetts_rarest_snakes_clings_to_survival_in_the_blue_hills/, http://www.masnakes.org/snakes/timber_rattle/, The Eruption of Mt. (Table 2.2.1) However, these surface waters contribute greatly to recreation resources and opportunities, wildlife habitat, park aesthetics, and sense of place. Cobbles of the rock are found in Early Pennsylvanian Pondville Conglomerate. code jsb93. Fossil plants. 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.] Northwest of Attleboro, Wamsutta overlies Diamond Hill Felsite as used by Skehan and Murray (in Skehan and others, 1979). What remains are the deep intrusive rocks, mostly granite and a type of porphyrytic rock known as the Hancock Porphyry. Just to the east of St Agnes was once the scene of a succession of seven or eight mines stepping down the valley to Trevaunance Cove. Seller assumes all responsibility for this listing. Preliminary report on the geology of the Blue Hills quadrangle, Massachusetts This edition published in 1940 in Boston, Mass. Mattapan Volcanic Complex is found in west and southwest part of Boston basin and beyond, and to the south in Blue Hills. Sharon syenite, … 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. code jsb93. Red and green shales may actually be Cambrian. South Norfolk Pool. Rotch conducted ground-breaking studies of the atmosphere at Blue Hill for many years, and meteorological data is still gathered at the site. Does not extend to Norfolk basin. Home > Our Geology > Blue Hills mine Blue Hills mine Posted on May 1st 2004. Throughout the Paleozoic, overlapping the rapid diversification of multi-ce… Hornblende gabbro and hornblende-pyroxene gabbro metamorphosed in part to hornblende gneiss and amphibolite. The net effect of such faulting is to have moved the older rocks to a position on top of and therefore to a higher elevation than the younger rock sequence of the Boston Basin. Preview of 1960 edition USGS topo map Blue Hills, Massachusetts . Exposures on east side of Woonsocket Hill, southeast of Woonsocket, RI, show cliffs of steeply dipping, thin-bedded, white to gray quartzite of Blackstone Group standing above green schistose conglomerate containing many flattened white to gray quartzite pebbles and interbedded green calcareous quartz schist. Assigned a Late Ordovician and Early Silurian age because of its close similarity, both chemically and mineralogically, to Quincy Granite. Water Resources . In the same area, schist of Blackstone Group is difficult to distinguish from those of the Bellingham because of low-grade metamorphism of Blackstone rocks; it is probable that some of the low-grade Blackstone Rocks mapped northwest of Woonsocket in Blackstone River valley are part of Bellingham. They also resemble Proterozoic Z Mattapan Volcanic Complex. Quartz conglomerate having abundant sandy matrix; boulder conglomerate, arkose; fossil plants. Interfingers with Wamsutta Formation in Narragansett basin. [6][7], In 1980, the hill was the subject of a prank by WNAC-TV's news department, where it was alleged that a volcano was erupting. It is the highest point in Norfolk County and the Greater Boston area. Blue Hills Volcano: The Blue Hills Reservation sits on top of an ancient Volcano. 2.1. Described as dark gray to dark blue, weathering buff brown to salmon. Basal beds nonconformably overlie Dedham Granite in northern part of Narragansett basin. of … 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. Located approximately ten miles south of downtown Boston, the reservation is one of the largest parcels of undeveloped conservation land within the Greater Boston metropolitan area. U.S. Geological Survey, 1941, USGS 1:31680-scale Quadrangle for Blue Hills, MA 1941: U.S. Geological … Massachusetts BLUE HILLS QUADRANGLE . Although Billings (1979) questions reliability of zircon ages from volcanic rocks, discovery of Proterozoic … Contains a few plant fossils (Goldsmith, 1991). These are shown within Wamsutta Formation on MA State bedrock map of Zen and others (1983) because of their proximity to Diamond Hill. Age is uncertain. Consists of gray sandstone and siltstone and lesser amounts of gray to black shale, gray conglomerate, and coal beds 10 m thick. 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. now mostly worn away to eroded remnants as the Blue Hills, Berkshires and White Mountains. 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. Isotopic age of 630 +/-15 Ma was determined using U-Pb methods on zircon by Zartman and Naylor (1984). Download this stock image: Massachusetts USGS Historical Topo Map MA Blue Hills 350865 1971 25000 Inverted Restoration - W4YCE7 from Alamy's library of millions of high resolution stock photos, illustrations and vectors. West and south of Boston, disconnected masses of quartzite and associated rocks are shown on State bedrock map by Zen and others (1983) as Westboro although not continuous with belts mapped by Nelson (1974) or Hepburn and DiNitto (1978). Some units were mapped or revised from recent field studies and from analysis of topographic (lidar) data … Volcanic rocks similar to Diamond Hill Felsite crop out west of Lake Pearl, between Franklin and Wrentham, on west flank of Norfolk basin. 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. They also resemble Proterozoic Z Mattapan Volcanic Complex. Rhode Island Formation is thickest and most extensive formation in Narragansett basin. Rocks have customarily been correlated with those of Pennsylvanian Narragansett basin; however, rocks in some exposures, such as the one at River St and Blackstone St in Woonsocket resemble Proterozoic Z Roxbury Conglomerate in Boston basin. Search for Massachusetts topo maps: Blue Hills Topographic Map. This volcano was active around 440 million years ago. Volcanic rocks similar to Diamond Hill Felsite crop out west of Lake Pearl, between Franklin and Wrentham, on west flank of Norfolk basin. Bellingham Conglomerate consists of conglomerate and lithic graywacke interbedded with chlorite phyllite and is confined to Bellingham basin. The history of Blue Hills is significant and has played a part in American history for almost four hundred years. 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 … The History of the Development of the Boston Basin Bedrock Geology The soils most commonly associated with these deposits are Charlton, Paxton, and Montauk soils. BLUE HILLS RESERVATION . Article navigation. (Goldsmith, 1991). Age is Proterozoic Z and possibly Early Cambrian (Goldsmith, 1991). Combined area of Quincy and Blue Hills rocks is 55 sq km. Roxbury Conglomerate forms base of Boston Bay Group. Acritarchs are diagnostic species that ranges in age from Proterozoic Z to Early Cambrian, but is most abundant in Proterozoic Z time (Lenk and others, 1982; [also see Goldsmith and others, 1982]). 4001 Washington Street. Quartzite, schist, calc-silicate quartzite, and amphibolite. Melaphyre in the Roxbury Conglomerate. Download this stock image: Massachusetts USGS Historical Topo Map MA Blue Hills 350023 1946 24000 Inverted Restoration - W4YBF4 from Alamy's library of millions of high resolution stock photos, illustrations and vectors. [10][11] The snakes are so rare in the state that they are rarely encountered by people. Download a high-resolution, GPS-compatible USGS topo map for Blue Hills, MA. Intrudes Zb. 00006. 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. Consists of conglomerate, lithic graywacke, sandstone, and shale. The park's varied terrain and scenic views mak… The folds are associated with geological … 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. The hills are composed of erosion-resistant red quartzite that is topped with a thin layer of glacial deposits. John Smith while exploring what is now Boston Harbor documented the sighting of several large hills, of which he named the largest Massachusetts Mount. USGS 1:31680-scale Quadrangle for Blue Hills, MA 1941; View Item View; Folder View; JSON; USGS 1:31680-scale Quadrangle for Blue Hills, MA 1941 . TH/FR: 10AM-9PM. Rising above the horizon, Great Blue Hill reaches a height of 635 feet, the highest of the 22 hills in the Blue Hills chain. Contact is probably a fault, but source of pebbles is quite obvious. natural fabric of forest and ponds, hilltops and wetlands. Intrudes Zdgr. The MA Geological Survey Department of Geosciences 269 Morrill Science Center University of Massachusetts 611 North Pleasant Street Amherst, MA 01003-9297. The Blue Hills Reservation (Blue Hills) located is approximately eight miles south of downtown Boston, at the intersection of Interstate 93 and Route 24. Item will ship to United States, but relationship to other Proterozoic Z syenite. Studied in this report, are referred to as Dedham north suite and volcanic rocks the. Intertongue with green argillite ( Kaye, 1980, written commun. red and... Seamless topo map coverage for the Hill was given by Early European explorers who, while sailing close... Expertgps mapping software includes seamless topo map Blue Hills volcano: the Blue Hills Porphyry. Gray, seriate to sub-porphyritic Granite to granodiorite, mafic minerals tend to be in clots locally. Billion years at contacts of Westwood with older mafic rocks 1895, p. 269 ) reaching Path... 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