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Cameron's Line
Cameron's Line is an Ordovician suture fault in the northeast United States that formed as part of the continental collision known as the Taconic orogeny around 450 million years ago. Named after geologist Eugene N. Cameron, who first published a description in the 1950s, it ties together the North American continental craton, the prehistoric Taconic island volcanic arc, and the bottom of the ancient Iapetus Ocean. Cameron himself credited his colleague William M. Agar with the initial discovery. Location Cameron's Line winds southward out of New England through western Connecticut. It has been identified in western Connecticut near Ridgefield before it heads into Westchester County, New York, then the Bronx, along the East River in Manhattan, through New York Bay, Staten Island, and into New Jersey. Geology The basement rocks of the Manhattan Formation located on the western side of Cameron's Line are metamorphosed sedimentary rocks and can be thought of as the remnan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years from the end of the Cambrian Period Megaannum, Ma (million years ago) to the start of the Silurian Period Ma. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Jersey
New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeast megalopolis, it is bordered to the northwest, north, and northeast by New York (state), New York State; on its east, southeast, and south by the Atlantic Ocean; on its west by the Delaware River and Pennsylvania; and on its southwest by Delaware Bay and Delaware. At , New Jersey is the List of U.S. states and territories by area, fifth-smallest state in land area. According to a 2024 United States Census Bureau, U.S. Census Bureau estimate, it is the List of U.S. states and territories by population, 11th-most populous state, with over 9.5 million residents, its highest estimated count ever. The state capital is Trenton, New Jersey, Trenton, and the state's most populous city is Newark, New Jersey, Newark. New Jersey is the only U.S. stat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ramapo Fault
The Ramapo Fault zone is a system of Fault (geology), faults between the northern Appalachian Mountains and Piedmont areas to the east. Magma was able to seep through linear fractures along the fault during the late Triassic and early Jurassic, producing episodic flood basalts responsible for the creation of the Watchung Mountains.NYC Regional Geology, Mesozoic Basins U.S. Geological Survey. Accessed October 25, 2009. Earthquake hazards in the New York City area Despite the rarity of strong East Coast earthquakes in the United States, they do sometimes occur. Furthermore, when these rare eastern U.S. events do occur, the areas affected by them are, on average ten times as large as western ones for events of the same magnitude. Thus, earthquakes ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hudson County, New Jersey
Hudson County is a county in the U.S. state of New Jersey, its smallest and most densely populated. Lying in the northeast of the state and on the west bank of the Hudson River, the North Jersey county is part of the state's Gateway Region and the New York metropolitan area. Its county seat is Jersey City,New Jersey County Map . Accessed February 27, 2023. the county's largest city in terms of both population and area. Established in 1840, it is named for , the sea captain who explored the area in 16 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Todt Hill
Todt Hill ( ) is a hill formed of serpentine rock on Staten Island, New York. It is the highest natural point in the five boroughs of New York City and the highest elevation on the entire Atlantic coastal plain from Florida to Cape Cod. The summit of the ridge is largely covered in woodlands as part of the Staten Island Greenbelt, although much of the surrounding area is developed and residential. It is considered one of the most exclusive and most expensive areas of Staten Island. History The name Todt comes from the German word "Tod" for "death" and may refer to the cemetery (the present Moravian Cemetery, opened in 1740 and now the island's largest cemetery) on the southwestern foot of the ridge near the town of New Dorp that has been in use since colonial days. An alternate explanation is that the name was given by early Dutch settlers because of treeless rocky exposures on the hilltop, caused by the soil of the Staten Island Serpentinite locality. At the beginning o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoboken, New Jersey
Hoboken ( ; ) is a City (New Jersey), city in Hudson County, New Jersey, Hudson County in the U.S. state of New Jersey. Hoboken is part of the New York metropolitan area and is the site of Hoboken Terminal, a major transportation hub. As of the 2020 United States census, the city's population was 60,419, an increase of 10,414 (+20.8%) from the 2010 United States census, 2010 census count of 50,005, which in turn reflected an increase of 11,428 (+29.6%) from the 38,577 counted in the 2000 United States census, 2000 census. The United States Census Bureau, Census Bureau's Population Estimates Program calculated a population of 57,010 for 2023, making it the List of United States cities by population, 708th-most populous municipality in the nation. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allochthon
upright=1.6, Schematic overview of a thrust system. The hanging wall block is (when it has reasonable proportions) called a window. A klippe is a solitary outcrop of the nappe in the middle of autochthonous material. An allochthon, or an allochthonous block, is a large block of rock which has been moved from its original site of formation, usually by low angle thrust faulting. The term is derived from Greek: ''allo'', meaning other, and ''chthon'', meaning earth. For other possible mechanisms see obduction. An allochthon which is isolated from the rock that pushed it into position is called a klippe. If an allochthon has a "hole" in it so that one can view the autochthon beneath the allochthon, the hole is called a "window" (or fenster). In generalized terms, the term is applied to any geologic units that originated at a distance from their present location. In the United States there are three notable allochthons, all of which were displaced nearly 50 km (31 miles) along ... [...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] |
Manhattan Prong
In the United States, the Manhattan Prong of the New England Uplands is a smaller belt of ancient rock in southern New York (state), New York (including Manhattan, the Bronx, and segments of Brooklyn and Staten Island), parts of Westchester County, New York, Westchester County, and upland portions of southwestern Connecticut. The bedrock underlying much of Manhattan consists of three rock formations: ''Fordham gneiss'', ''Manhattan schist'', and ''Tuckahoe marble (Inwood marble)'', which are well suited for the foundations of Manhattan's skyscrapers. The Manhattan Prong and the Reading Prong are separated by the Newark Basin in the south, but the two features merge at the northern terminus of the Newark Basin in the vicinity of Peekskill, New York. A band of mountains that rise nearly one thousand feet along the northwestern margin of the Newark Basin in New York and New Jersey are called the Ramapo Mountains. Another belt of ancient metamorphic and igneous rock crops out along th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ramapo Mountains
The Ramapo Mountains are a forested chain of the Appalachian Mountains in northeastern New Jersey and southeastern New York, in the United States. They range in height from in New Jersey, and in New York. Several parks and forest preserves encompass parts of the Ramapos (see Points of interest, below), and many hiking trails are in the Ramapos, including sections of the Appalachian Trail, which is maintained and updated in the Ramapo Mountains by the New York–New Jersey Trail Conference. In New York, the mountains serve to divide Orange and Rockland Counties. The difficulty of crossing the mountains is what caused Rockland County to break away from Orange County in 1798. The mountains are named after the Ramapo Fault, which trends northeast to southwest, and separates the eastern Piedmont geologic province from the Highland province. The Ramapos are composed of granite, gneiss, and marble, as old as 1.3 billion years. Points of interest * Arden, the former E.H. Har ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grenville Orogeny
The Grenville orogeny was a long-lived Mesoproterozoic mountain-building event associated with the assembly of the supercontinent Rodinia. Its record is a prominent orogenic belt which spans a significant portion of the North American continent, from Labrador to Mexico, as well as to Scotland. Grenville orogenic crust of mid-late Mesoproterozoic age (1250980 Ma) is found worldwide, but generally only events which occurred on the southern and eastern margins of Laurentia are recognized under the "Grenville" name. These orogenic events are also known as the Kibaran orogeny in Africa, the Dalslandian orogeny in Western Europe, and the Sunsás orogeny in Brazil. Timescale The problem of timing the Grenville orogeny is an area of some contention. The timescale outlined by Toby Rivers in 2002 is derived from the well-preserved Grenville Province and represents one of the most detailed records of the orogeny. This classification considers the classical Grenville designation to cover ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
