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Little Round Top
Little Round Top is the smaller of two rocky hills south of Gettysburg, Pennsylvania—the companion to the adjacent, taller hill named Big Round Top. It was the site of an unsuccessful assault by Confederate troops against the Union left flank on July 2, 1863, the second day of the Battle of Gettysburg, during the American Civil War. Little Round Top was successfully defended by a brigade under Colonel Strong Vincent, who was mortally wounded during the fighting and died five days later. The 20th Maine Volunteer Infantry Regiment, commanded by Colonel Joshua Lawrence Chamberlain, fought its most famous engagement there, culminating in a dramatic downhill bayonet charge. The battle at Little Round Top subsequently became one of the most well-known actions at Gettysburg, and of the entire war. Geography Little Round Top is a large diabase spur of Big Round Top with an oval crest that forms a short ridgeline with a summit of prominence above the saddle point582.655 ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joshua Lawrence Chamberlain
Joshua Lawrence Chamberlain (born Lawrence Joshua Chamberlain, September 8, 1828February 24, 1914) was an American college professor and politician from Maine who volunteered during the American Civil War to join the Union Army. He became a highly respected and decorated Union Officer (armed forces), officer, reaching the rank of Brigadier general (United States), brigadier general (and Brevet (military), brevet Major general (United States), major general). He is best known for his gallantry at the Battle of Gettysburg, leading a bayonet charge, for which he was awarded the Medal of Honor. Chamberlain was commissioned a lieutenant colonel in the 20th Maine Volunteer Infantry Regiment in 1862, and fought at the Battle of Fredericksburg. He became commander of the regiment in June 1863 when losses at the Battle of Chancellorsville elevated the original commander, Colonel Adelbert Ames, to brigade command. During the Battle of Gettysburg, second day, second day's fighting at Gettysb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Culp's Hill
Culp's Hill,. The modern U.S. Geographic Names System refers to "Culps Hill". which is about south of the center of Gettysburg, Pennsylvania, played a prominent role in the Battle of Gettysburg. It consists of two rounded peaks, separated by a narrow saddle. Its heavily wooded higher peak is above sea level. The lower peak is about 100 feet (30 m) shorter than its companion. The eastern slope descends to Rock Creek (Monocacy River), Rock Creek, about 160 feet (50 m) lower in elevation, and the western slope is to a saddle with Stevens Knoll (formerly McKnight's Hill) with a summit lower than the main Culp's Hill summit. The hill was owned in 1863 by farmer Henry Culp and was publicized as "Culp's Hill" by October 31, 1865. During the Battle of Gettysburg, July 1–3, 1863, Culp's Hill was a critical part of the Union Army defensive line, the principal feature of the right flank, or "barbed" portion of what is described as the "fish-hook" line. Holding the hill was by i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newark Supergroup
The Newark Supergroup, also known as the Newark Group, is an assemblage of Upper Triassic and Lower Jurassic sedimentary and volcanic rocks which outcrop intermittently along the east coast of North America. They were deposited in a series of Triassic basins, the Eastern North American rift basins, approximately 220–190 million years ago. The basins are characterized as aborted rifts, with half-graben geometry, developing parallel to the main rift of the Atlantic Ocean which formed as North America began to separate from Africa. Exposures of the Newark Supergroup extend from South Carolina north to Nova Scotia. Related basins are also found underwater in the Bay of Fundy. The group is named for the city of Newark, New Jersey. Characteristics The Newark Supergroup consists largely of poorly sorted nonmarine sediments; typical rocks are breccia, conglomerate, arkose sandstone, siltstone, and shale. Most of the strata are red beds that feature ripple marks, mud cracks, and eve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devil's Den
Devil's Den is a boulder-strewn hill on the south end of Houck's Ridge at Gettysburg Battlefield, used by artillery and sharpshooters on the second day of the 1863 Battle of Gettysburg during the American Civil War. A tourist attraction since the memorial association era, several boulders are worn from foot traffic and the site includes numerous cannons, memorials, and walkways, including a bridge spanning two boulders. History Devil's Den was formed with Little Round Top (to the east) and Big Round Top (southeast) by periglacial frost wedging of the igneous landform formed 200 million years ago when a diabase sill intruded through the Triassic Gettysburg plain. The feature acquired its foreboding name prior to the 1863 battle. Throughout the mid-19th century, local residents believed that the crevices between the boulders were home to a large snake. The size of the reptile varied between accounts, but reports ranged from to as large as . The snake became known as "The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic–Jurassic Extinction Event
The Triassic–Jurassic (Tr-J) extinction event (TJME), often called the end-Triassic extinction, marks the boundary between the Triassic and Jurassic periods, . It represents one of five major extinction events during the Phanerozoic, profoundly affecting life on land and in the oceans. In the seas, about 23–34% of marine genus, genera disappeared; Coral, corals, Bivalvia, bivalves, Brachiopod, brachiopods, Bryozoa, bryozoans, and Radiolaria, radiolarians suffered severe losses of diversity and Conodont, conodonts were completely wiped out, while marine vertebrates, Gastropoda, gastropods, and benthic foraminifera were relatively unaffected. On land, all Archosauromorpha, archosauromorph reptiles other than Crocodylomorpha, crocodylomorphs, dinosaurs, and pterosaurs became extinct. Crocodylomorphs, dinosaurs, pterosaurs, and mammals were left largely untouched, allowing them to become the dominant land animals for the next 135 million years. Plants were likewise significantly a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous
Igneous rock ( ), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of the top of the Earth's crust by volume. Igneous rocks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS
The United States Geological Survey (USGS), founded as the Geological Survey, is an government agency, agency of the United States Department of the Interior, U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on March 3, 1879, to study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The agency also makes maps of planets and moons, based on data from List of NASA missions, U.S. space probes. The sole scientific agency of the U.S. Department of the Interior, USGS is a fact-finding research organization with no regulatory responsibility. It is headquartered in Reston, Virginia, with major offices near Lakewood, Colorado; at the Denver Federal Center; and in NASA Research Park in California. In 2009, it employed about 8,670 people. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cumberland Township, Adams County, Pennsylvania
Cumberland Township is a township in Adams County, Pennsylvania, United States. The population was 7,031 at the 2020 census. In 1863, the American Civil War Battle of Gettysburg took place mainly in Cumberland Township, which surrounds the borough of Gettysburg on three sides. Geography According to the United States Census Bureau, the township has a total area of , of which is land and , or 0.53%, is water. of area is held by the Gettysburg National Military Park, making up almost 20% of the municipality's area. Eisenhower National Historic Site is also mainly in the township. Populated places in the township include an unincorporated community named Greenmount. Demographics As of the census, there were 6,300 people living in the township. The population density was . There were 2,365 housing units at an average density of . The racial makeup of the township was 93.84% White, 2.54% African American, 0.30% Native American, 1.45% Asian, 0.02% Pacific Islander, 1. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on March 3, 1879, to study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The agency also makes maps of planets and moons, based on data from U.S. space probes. The sole scientific agency of the U.S. Department of the Interior, USGS is a fact-finding research organization with no regulatory responsibility. It is headquartered in Reston, Virginia, with major offices near Lakewood, Colorado; at the Denver Federal Center; and in NASA Research Park in California. In 2009, it employed about 8,670 people. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on its hundredth anniversary, was "Earth Science in the Pub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Baltimore Sun
''The Baltimore Sun'' is the largest general-circulation daily newspaper based in the U.S. state of Maryland and provides coverage of local, regional, national, and international news. Founded in 1837, the newspaper was owned by Tribune Publishing until May 2021, when it was acquired by Alden Global Capital, which operates its media properties through Digital First Media. David D. Smith, the executive chairman of Sinclair Broadcast Group, closed a deal to buy the paper on January 15, 2024. History 19th century ''The Sun'' was founded on May 17, 1837, by Arunah Shepherdson Abell and two associates, William Moseley Swain from Rhode Island, and Azariah H. Simmons from Philadelphia, where they had started and published the '' Public Ledger'' the year before. Abell became a journalist with the ''Providence Patriot'' and later worked with newspapers in New York City and Boston.Van Doren, Charles and Robert McKendry, ed., ''Webster's American Biographies''. (Springfield, Massa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diabase
Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). ''Diabase'' is the preferred name in North America, while ''dolerite'' is the preferred name in the rest of the English-speaking world, where sometimes the name ''diabase'' refers to altered dolerites and basalts. Some geologists prefer to avoid confusion by using the name ''microgabbro''. The name ''diabase'' comes from the French , and ultimately from the Greek 'act of crossing over, transition', whereas the name ''dolerite'' comes from the French , from the Greek 'deceitful, deceptive', because it was easily confused with diorite. Petrography Diabase normally has a fine but visible texture of euhedral lath-shaped plagioclase crystals (62%) set i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
