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Ausable Chasm
Ausable Chasm is a sandstone Canyon, gorge and tourist attraction located near the hamlet of Keeseville, New York (state), New York, United States, due west of Port Kent, New York, Port Kent. The gorge is about long and is about deep. Ausable Chasm is the namesake of the Ausable River (New York), Ausable River, which runs through the gorge and empties into Lake Champlain about away. The gorge started forming about 10,000 years ago through headward erosion caused by Rainbow Falls, a waterfall at the gorge's southern extreme. The gorge is a major tourist attraction and landmark in the Adirondacks region of Upstate New York. Geology Ausable Chasm is carved out of a 500-million-year-old, -thick exposure of Cambrian Potsdam Sandstone. The sandstone of the gorge, formed from ancient tidal flats, preserves ripple marks, ichnofossils, and rare mid-Cambrian Scyphomedusae jellyfish fossils. Ausable Chasm itself is a result of the conclusion of the Last Glacial Period, last glacial ...
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Keeseville
Keeseville is a hamlet (New York), hamlet (and census-designated place) in Clinton County, New York, Clinton and Essex County, New York, Essex counties, New York (state), New York, United States. The population was 1,815 at the 2010 census. The hamlet was named after the Keese family, early settlers from Vermont. It developed along the Ausable River (New York), Ausable River, which provided water power for mills and industrial development. Keeseville is in the towns of Au Sable, New York, Au Sable and Chesterfield, New York, Chesterfield and is south of the city of Plattsburgh (city), New York, Plattsburgh. It is located inside what are now the boundaries of Adirondack Park, which was authorized in the 20th century. On January 23, 2013, the town's select board voted to dissolve the village. As of 2016, the U.S. Census Bureau still had Keeseville listed as a village. History The hamlet was originally called "Anderson Falls" by settlers from New England, who moved into the area ...
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Iroquois
The Iroquois ( ), also known as the Five Nations, and later as the Six Nations from 1722 onwards; alternatively referred to by the Endonym and exonym, endonym Haudenosaunee ( ; ) are an Iroquoian languages, Iroquoian-speaking Confederation#Indigenous confederations in North America, confederacy of Native Americans in the United States, Native Americans and First Nations in Canada, First Nations peoples in northeast North America. They were known by the French during the Colonial history of the United States, colonial years as the Iroquois League, and later as the Iroquois Confederacy, while the English simply called them the "Five Nations". Their country has been called wikt:Iroquoia, Iroquoia and Haudenosauneega in English, and '':fr:Iroquoisie, Iroquoisie'' in French. The peoples of the Iroquois included (from east to west) the Mohawk people, Mohawk, Oneida people, Oneida, Onondaga people, Onondaga, Cayuga people, Cayuga, and Seneca people, Seneca. After 1722, the Iroquoian-sp ...
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Mohawk People
The Mohawk, also known by their own name, (), are an Indigenous peoples of the Americas, Indigenous people of North America and the easternmost nation of the Haudenosaunee, or Iroquois Confederacy (also known as the Five Nations or later the Six Nations). Mohawk are an Iroquoian languages, Iroquoian-speaking people with communities in southeastern Canada and northern New York (state), New York State, primarily around Lake Ontario and the St. Lawrence River. As one of the five original members of the Iroquois Confederacy, the Mohawk are known as the Keepers of the Eastern Door who are the guardians of the confederation against invasions from the east. Today, Mohawk people belong to the Mohawk Council of Akwesasne, Mohawks of the Bay of Quinte First Nation, Mohawks of Kahnawà:ke, Mohawks of Kanesatake, Six Nations of the Grand River, and Saint Regis Mohawk Tribe, a federally recognized tribe in the United States. At the time of European contact, Mohawk people were based in th ...
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Ausable Chasm Grand Flume
Au Sable, Ausable or Aux Sable may refer to a documentary film or various places: * Au Sable (documentary), a film about the Michigan river, canoe race and people Illinois * Aux Sable Township, Grundy County, Illinois Michigan * Au Sable Township, Iosco County, Michigan ** Au Sable, Michigan, an unincorporated community in the above township * Au Sable Township, Roscommon County, Michigan New York * Au Sable, New York *Ausable Chasm Ausable Chasm is a sandstone Canyon, gorge and tourist attraction located near the hamlet of Keeseville, New York (state), New York, United States, due west of Port Kent, New York, Port Kent. The gorge is about long and is about deep. Ausable ... See also * Au Sable River (other) {{geodis ...
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Pothole (landform)
In Earth science, a pothole is a smooth, bowl-shaped or cylindrical hollow, generally deeper than wide, found carved into the rocky bed of a watercourse. Other names used for riverine potholes are pot, (stream) kettle, giant's kettle, evorsion, hollow, rock mill, churn hole, eddy mill, and kolk.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds., 2011. ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 800 pp. Although somewhat related to a pothole in origin, a plunge pool (or plunge basin or waterfall lake) is the deep depression in a stream bed at the base of a waterfall. It is created by the erosional forces of turbulence generated by water falling on rocks at a waterfall's base where the water impacts.Marshak, Stephen, 2009. ''Essentials of Geology,'' W. W. Norton & Company, 3rd ed. Potholes are also sometimes referred to as swirlholes. This word was created to avoid confusion with an English term for a vertical or steeply inclin ...
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Paleochannel
In the Earth sciences, a palaeochannel, also spelled paleochannel, is a significant length of a river or stream channel which no longer conveys fluvial discharge as part of an active fluvial system. The term ''palaeochannel'' is derived from the combination of two words, ''palaeo'' or ''old'', and '' channel''; i.e., a palaeochannel is an old channel. Palaeochannels may be preserved either as abandoned surface channels on the surface of river floodplains and terraces or infilled and partially or fully buried by younger sediments. The fill of a palaeochannel and its enclosing sedimentary deposits may consist of unconsolidated, semi-consolidated, or well-cemented sedimentary strata depending on the action of tectonics and diagenesis during their geologic history after deposition. The abandonment of an active fluvial channel and the resulting formation of a palaeochannel can be the result of tectonic processes, geomorphologic processes, anthropogenic activities, climatic changes, o ...
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Joint (geology)
In geology, and more specifically in structural geology, a joint is a break (fracture (geology), fracture) of natural origin in a layer or body of Rock (geology), rock that lacks visible or measurable movement parallel to the surface (plane) of the fracture ("Mode 1" Fracture). Although joints can occur singly, they most frequently appear as joint sets and systems. A ''joint set'' is a family of parallel, evenly spaced joints that can be identified through mapping and analysis of their orientations, spacing, and physical properties. A ''joint system'' consists of two or more intersecting joint sets. The distinction between joints and Fault (geology), faults hinges on the terms ''visible'' or ''measurable,'' a difference that depends on the scale of observation. Faults differ from joints in that they exhibit visible or measurable lateral movement between the opposite surfaces of the fracture ("Mode 2" and "Mode 3" Fractures). Thus a joint may be created by either strict movement o ...
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Scarp Retreat
Scarp retreat is a geological process through which the location of an escarpment changes over time. Typically the cliff is undermined, rocks fall and form a Scree, talus slope, the talus is chemically or mechanically Weathering, weathered and then removed through water or wind erosion, and the process of undermining resumes. Scarps may retreat for tens of kilometers in this way over relatively short geological time spans, even in arid locations. Scarp profiles A scarp is a line of cliffs that has usually been formed by faulting or erosion. If it is protected by a strong caprock, or if it contains vertical fractures, it may retain its steep profile as it retreats. Scarps in dry climates typically have a near-vertical upper face, that may account for 10% - 75% of the total height, with a talus-covered sloping rampart forming the lower section. The caprock is undermined as the rampart and face are eroded, and eventually a section collapses. A strong caprock will typically crea ...
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Superficial Deposits
Superficial deposits (or surficial deposits) refer to geological deposits typically of Quaternary age (less than 2.6 million years old) for the Earth. These geologically recent unconsolidated sediments may include stream channel and floodplain deposits, beach sands, talus gravels and glacial drift and moraine. All pre-Quaternary deposits are referred to as bedrock. Types and history There are several types of superficial deposit, including raised beaches and brickearth. These were formed in periods of climate change during the ice ages. The raised beaches were generally formed during periods of higher sea level, when ice sheets were at a minimum, and the sand and shingle deposits can be seen in many low cliffs. The brickearth is originally a wind-blown dust deposited under extremely cold, dry conditions but much has been re-deposited by flood water and mixed with flints. Superficial deposits were originally recorded only onshore and around the coast where they were laid down b ...
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Post-glacial Rebound
Post-glacial rebound (also called isostatic rebound or crustal rebound) is the rise of land masses after the removal of the huge weight of ice sheets during the last glacial period, which had caused isostatic depression. Post-glacial rebound and isostatic depression are phases of glacial isostasy (glacial isostatic adjustment, glacioisostasy), the deformation of the Earth's crust in response to changes in ice mass distribution. The direct raising effects of post-glacial rebound are readily apparent in parts of Northern Eurasia, Northern America, Patagonia, and Antarctica. However, through the processes of ''ocean siphoning'' and ''continental levering'', the effects of post-glacial rebound on sea level are felt globally far from the locations of current and former ice sheets.Milne, G.A., and J.X. Mitrovica (2008) ''Searching for eustasy in deglacial sea-level histories.'' Quaternary Science Reviews. 27:2292–2302. Overview During the last glacial period, much of northern Euro ...
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Champlain Sea
The Champlain Sea () was a prehistoric inlet of the Atlantic Ocean into the North American continent, created by the retreating ice sheets during the closure of the last glacial period. The inlet once included lands in what are now the Canadian provinces of Quebec and Ontario, as well as parts of the American states of New York and Vermont. Today, the remains of the sea include the St. Lawrence Seaway, Lake Champlain, Lake of Two Mountains on the lower Ottawa River, and the lower Saguenay River, as well as other lakes, islands and shores. Origins The mass of ice from the continental ice sheets had depressed the rock beneath it over millennia. At the end of the last glacial period, while the rock was still depressed, the Saint Lawrence and Ottawa River valleys, as well as modern Lake Champlain, at that time Lake Vermont, were below sea level and flooded with rising worldwide sea levels, once the ice no longer prevented the ocean from flowing into the region. As the land ...
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