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Cockeysville Marble
The Cockeysville Marble is a Precambrian, Cambrian, or Ordovician marble formation in Baltimore, Carroll, Harford and Howard Counties, Maryland. It is described as a predominantly metadolomite, calc-schist, and calcite marble, with calc-gneiss and calc-silicate marble being widespread but minor.''Geologic Map of Maryland'', 1968. Cleaves, E. T., Edwards, J. Jr., and Glaser, J. D. Maryland Geological Survey. Scale 1:250,000. The extent of this formation was originally mapped in 1892 within Baltimore County. Quarrying The Cockeysville Marble has been quarried in Beaver Dam within Cockeysville and other locations in Maryland. A historical account is given in ''Maryland Geological Survey Volume Two''. The Cockeysville was also mined for crushed stone at what is now called Quarry Lake. (Greensberg Quarry), Bare Hills, Baltimore Co., Maryland, USA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precambrian
The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian accounts for 88% of the Earth's geologic time. The Precambrian is an informal unit of geologic time, subdivided into three eons ( Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of Earth about 4.6 billion years ago ( Ga) to the beginning of the Cambrian Period, about million years ago ( Ma), when hard-shelled creatures first appeared in abundance. Overview Relatively little is known about the Precambrian, despite it making up roughly seven-eighths of the Earth's history, and what is known has largely been discovered from the 1960s onwards. The Precambrian fossil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcite
Calcite is a Carbonate minerals, carbonate mineral and the most stable Polymorphism (materials science), polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on Scratch hardness, scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, and vaterite is even less stable. Etymology Calcite is derived from the German ''Calcit'', a term from the 19th century that came from the Latin word for Lime (material), lime, ''calx'' (genitive calcis) with the suffix "-ite" used to name minerals. It is thus etymologically related to chalk. When applied by archaeology, archaeologists and stone trade pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Types Of Marble
The following is a list of various types of marble according to location. (NB: Marble-like stone which is not true marble according to geologists is included, but is indicated by ''italics'' with geologic classification given as footnote. Africa Egypt *Galala Marble *Sinai Pearl Marble *Milly Grey Marble *Sunny Marble *Alabaster Marble Ethiopia * Daleti marble, Western Welega: white, white with grey veins and other colours * Enda Tikurir marble, Western Tigray * Newi marble, Central Tigray * Akmara marble, Central Tigray * Dichinamo marble, Western Tigray Tunisia * ''Giallo antico'' — also known as Numidian marble (''marmor numidicum'' in Latin), was a yellow marble quarried in Roman times from the area of Chemtou, ancient Simmithu Asia China *Hàn Bái Yǜ Marable (Chinese: ) A type of white marble used in China for building and sculpting. India *Makrana Marble Pure White Marble for Home and temple, outoor, building and sculpting. Europe Belgium * '' Noir Belge'' * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Monument
The Washington Monument is an obelisk shaped building within the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army (1775–1784) in the American Revolutionary War and the first President of the United States (1789–1797). Located almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest predominantly stone structure and the world's tallest obelisk, standing tall according to the U.S. National Geodetic Survey (measured 2013–14) or tall, according to the National Park Service (measured 1884). It is the tallest monumental column in the world if all are measured above their pedestrian entrances. It was the tallest structure in the world between 1884 and 1889, after which it was overtaken by the Eiffel Tower in Paris. Previously, the tallest structure was the Cologne Cathedral. Construction of the presidenti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington Monument (Baltimore)
The Washington Monument is the centerpiece of intersecting Mount Vernon Place and Washington Place, an urban square in the Mount Vernon-Belvedere neighborhood north of downtown Baltimore, Maryland. It was the first major monument begun to honor George Washington (1732–1799). History The Monument, a colossal landmark column, was designed by American architect Robert Mills (1781–1855), who also designed the later Washington Monument on the National Mall in Washington, D.C. Construction began in 1815 on land donated by Colonel John Eager Howard (1752–1827), from his extensive "Belvidere" estate just north of Baltimore Town, and the masonry work was completed by 1829. The 178 foot, 8 inch doric column holds a ground-floor gallery offering digital exhibits about the construction of the Monument, the history of Mount Vernon and Washington Places neighborhood and of the life and accomplishments of General and President George Washington. Climbing the 227 steps to the top provide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marriottsville, Maryland
Marriottsville is an unincorporated community in Howard, Carroll and Baltimore counties, Maryland, United States. Marriottsville is located along Marriottsville Road near the Carroll County line, north-northwest of Columbia. History Marriottsville is named after General Richard Marriott's estate. Marriott was an heir of John Marriott of Severn who settled in Anne Arundel County in 1664. The land was originally part of a large section of land patented by Charles Carroll of Carrollton. Waverley slave plantation occupied a significant portion of the land which was known as the Howard District of Anne Arundel County. The village was home to a magnesium limestone quarry, and was known for farms such as "Prospect Hill", and School Board member Henry O. Devries (1826-1902) farm. On 22 March 1836, a railroad car derailed on a demonstration of the new railroad technology with 40 city leaders on board. In 1866, Reese's Mill was washed out by regional flooding. From 1965 to 1974, lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Marietta Inc
Martin may refer to: Places * Martin City (other) * Martin County (other) * Martin Township (other) Antarctica * Martin Peninsula, Marie Byrd Land * Port Martin, Adelie Land * Point Martin, South Orkney Islands Australia * Martin, Western Australia * Martin Place, Sydney Caribbean * Martin, Saint-Jean-du-Sud, Haiti, a village in the Sud Department of Haiti Europe * Martin, Croatia, a village in Slavonia, Croatia * Martin, Slovakia, a city * Martín del Río, Aragón, Spain * Martin (Val Poschiavo), Switzerland England * Martin, Hampshire * Martin, Kent * Martin, East Lindsey, Lincolnshire, hamlet and former parish in East Lindsey district * Martin, North Kesteven, village and parish in Lincolnshire in North Kesteven district * Martin Hussingtree, Worcestershire * Martin Mere, a lake in Lancashire ** WWT Martin Mere, a wetland nature reserve that includes the lake and surrounding areas * Martin Mill, Kent North America Canada * Rural Muni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quarry Lake (Maryland)
Quarry Lake is a manmade lake in the Pikesville area of Baltimore County, Maryland. Originally a marble quarry, it is now one of the deepest lakes in the state. The lake is surrounded by Quarry Lake at Greenspring, a mixed residential development and commercial development that includes single-family homes, condominiums, shops, and office buildings. History The lake itself is a flooded quarry that dates back to 1877. located off Greenspring Avenue, between Old Court Road and Smith Avenue. The quarry was likely originally run by the Boyle family, later transferred to the McMahon family. The McMahon Quarry was purchased by the Arundel Corporation in 1937, and became known as the Greenspring Quarry. The quarry operated to produce crushed stone from a gneissic phase of the Cockeysville Marble, though other minerals were also found at the site. The Arundel Corporation of Baltimore survives as a subsidiary of Vulcan Materials Company. In 1999, an agreement was reached to allow a new ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Bullock Clark
William Bullock Clark (December 15, 1860 – July 27, 1917), was an American geologist. Early life William Bullock Clark was born on December 15, 1860, at Brattleboro, Vermont, to Helen (née Bullock) and Barna Atherton Clark. Clark had private tutors and graduated from Brattleboro High School. He graduated with a Bachelor of Arts from Amherst College in 1884. He graduated with a PhD from the University of Munich in 1887. Clark graduated from Amherst College with a Doctor of Laws in 1908. He also spent time in the field doing geographical surveys in Great Britain and Prussia. Career In 1888 he became connected with the United States Geological Survey. Clark was a professor of geology at Johns Hopkins University who led the department through a period of great growth, during which it awarded forty-six PhDs, twice as many as any other university. He was appointed instructor at Johns Hopkins in 1887, promoted to associate in 1889, and promoted to associate professor in 1892 and pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaver Dam, Maryland
Beaver Dam is a flooded marble quarry in Cockeysville, Maryland that has been used as a swimming location since the 1930s. Currently, a 30-acre swim club is located there with two swimming pools, a volleyball court, picnic tables and grills, a creek, and snack house. The 40 foot deep freshwater quarry has floating platforms, two rolling logs, diving and jumping platforms, and a rope swing. The quarry began operation in the 19th century and much of the labor was that of Irish immigrants using hand drills, hammers and chisels. In 1878, Hugh Sisson acquired the property and began using the latest equipment available: steam powered derricks, shovels, and diamond bit drills. Stone was loaded onto wagons and pulled by oxen to the nearby Northern Central Railway in Cockeysville until the quarry site itself was connected to the rail in 1866. The dolomitic marble, known to geologists as the Cockeysville Marble The Cockeysville Marble is a Precambrian, Cambrian, or Ordovician marble forma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cockeysville Formation Massive Metadolostone Mbr
Cockeysville is a census-designated place (CDP) in Baltimore County, Maryland, United States. The population was 20,776 at the 2010 census. History Cockeysville was named after the Cockey family who helped establish the town. Thomas Cockey (1676–1737) settled in Limestone Valley in 1725 at Taylor's Hall (an area now just north of Padonia Road and east of Interstate 83). Joshua Frederick Cockey (1765–1821) built one of the first homes in the area in 1798 and built the first commercial structure, a hotel, in 1810 in what would become the village of Cockeysville. His son, Judge Joshua F. Cockey (1800–1891), was a lifelong resident in the village. As a businessman before being appointed as judge, in the 1830s he built the train station (which would be a stop on the Pennsylvania Railroad) and accompanying commercial buildings. Cockeysville was the scene of some Civil War activity. Confederate soldiers pushed into the Baltimore area, intending to cut off the city and Washington f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silicate
In chemistry, a silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula , where . The family includes orthosilicate (), metasilicate (), and pyrosilicate (, ). The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate. The name "silicate" is sometimes extended to any anions containing silicon, even if they do not fit the general formula or contain other atoms besides oxygen; such as hexafluorosilicate .Most commonly, silicates are encountered as silicate minerals. For diverse manufacturing, technological, and artistic needs, silicates are versatile materials, both natural (such as granite, gravel, and garnet) and artificial (such as Portland cement, ceramics, glass, and waterglass). Structural principles In all silicates, silicon atom occupies the center of an idealized tetrahedron whose corner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
