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Genesee River
The Genesee River ( ) is a tributary of Lake Ontario flowing northward through the Twin Tiers of Pennsylvania and New York (state), New York in the United States. The river contains several waterfalls in New York at Letchworth State Park and Rochester, New York, Rochester. The river was historically used as a border between the lands of the Seneca people, Seneca to the east and the Erie people, Erie and Wenrohronon, Wenro to the west. Later, the river provided the original power for the Rochester area's 19th century mills, and still provides hydroelectric power for downtown Rochester. Flooding occurred periodically in the river valley before construction of the Mount Morris Dam in the 1950s. Geology The Genesee is the remaining western branch of Glacial geology of the Genesee River, a preglacial system, with rock layers tilted an average of 40 feet (12 m) per mile, so the river flows across progressively older bedrock as it flows northward. It begins in exposing the Allegheny P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seneca Tribe
The Seneca ( ; ) are a group of indigenous peoples of the Americas, Indigenous Iroquoian languages, Iroquoian-speaking people who historically lived south of Lake Ontario, one of the five Great Lakes in North America. Their nation was the farthest to the west within the Six Nations or Iroquois, Iroquois League (Haudenosaunee) in New York before the American Revolution. For this reason, they are called “The Keepers of the Western Door.” In the 21st century, more than 10,000 Seneca live in the United States, which has three federally recognized Seneca tribes. Two of them are centered in New York: the Seneca Nation of Indians, with five territories in western New York near Buffalo, New York, Buffalo; and the Tonawanda Band of Seneca, Tonawanda Seneca Nation. The Seneca-Cayuga Nation is in Oklahoma, where their ancestors were relocated from Ohio during the Indian Removal. Approximately 1,000 Seneca live in Canada, near Brantford, Ontario, at the Six Nations of the Grand River Fir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Letchworth State Park
Letchworth State Park is a New York State Park located in Livingston and Wyoming Counties in western Upstate New York. The park is roughly long, following the course of the Genesee River as it flows north through a deep gorge and over several large waterfalls. It is located southwest of Rochester and southeast of Buffalo, and spans portions of the Livingston County towns of Leicester, Mount Morris and Portage, as well as the Wyoming County towns of Castile and Genesee Falls. In 1859, Buffalo industrialist William Pryor Letchworth (1823–1910) began purchasing land near the Middle Falls, and started construction of his Glen Iris Estate. In 1906 he bequeathed the estate to New York, which soon after became the core of the newly created Letchworth State Park. ''Note:'' This includes an''Accompanying photographs''/ref> The park prominently features three large waterfallsthe Upper, Middle, and Lower Fallson the Genesee River, which flows within a deep gorge that wind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mississippian Age
The Mississippian ( ), also known as Lower Carboniferous or Early Carboniferous, is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous period lasting from roughly 358.9 to 323.2 million years ago. As with most other geochronologic units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years. The Mississippian is so named because rocks with this age are exposed in the Mississippi Valley. The Mississippian was a period of marine transgression in the Northern Hemisphere: the sea level was so high that only the Fennoscandian Shield and the Laurentian Shield were dry land. The cratons were surrounded by extensive delta systems and lagoons, and carbonate sedimentation on the surrounding continental platforms, covered by shallow seas. In North America, where the interval consists primarily of marine limestones, it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Record
The geologic record in stratigraphy, paleontology and other natural sciences refers to the entirety of the layers of rock strata. That is, deposits laid down by volcanism or by deposition of sediment derived from weathering detritus (clays, sands etc.). This includes all its fossil content and the information it yields about the history of the Earth: its past climate, geography, geology and the evolution of life on its surface. According to the law of superposition, sedimentary and volcanic rock layers are deposited on top of each other. They harden over time to become a solidified ( competent) rock column, that may be intruded by igneous rocks and disrupted by tectonic events. Correlating the rock record At a certain locality on the Earth's surface, the rock column provides a cross section of the natural history in the area during the time covered by the age of the rocks. This is sometimes called the ''rock history'' and gives a window into the natural history of the locatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock (geology)
In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its Chemical compound, chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the Earth's crust, crust, and most of its interior, except for the liquid Earth's outer core, outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects. Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments, which in turn are formed by the weathe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shale
Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of Clay mineral, clay minerals (hydrous aluminium phyllosilicates, e.g., Kaolinite, kaolin, aluminium, Al2Silicon, Si2Oxygen, O5(hydroxide, OH)4) and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.Blatt, Harvey and Robert J. Tracy (1996) ''Petrology: Igneous, Sedimentary and Metamorphic'', 2nd ed., Freeman, pp. 281–292 Shale is characterized by its tendency to split into thin layers (Lamination (geology), laminae) less than one centimeter in thickness. This property is called ''Fissility (geology), fissility''. Shale is the most common sedimentary rock. The term ''shale'' is sometimes applied more broadly, as essentially a synonym for mudrock, rather than in the narrower sense of clay-rich fissile mudrock. Texture Shale typically exhibits varying degrees of fissility. Because of the parallel orientation of clay mineral flakes in shale, it breaks in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar, because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand, sandstone may be imparted any color by impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topography, topographic features, certain colors of sandstone have become strongly identified with certain regions, such as the red rock deserts of Arches National Park and other areas of the Southwestern United States, American Southwest. Rock formations composed of sandstone usually allow the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conglomerate (geology)
Conglomerate () is a sedimentary rock made up of rounded gravel-sized pieces of rock surrounded by finer-grained sediments (such as sand, silt, or clay). The larger fragments within conglomerate are called clasts, while the finer sediment surrounding the clasts is called the matrix. The clasts and matrix are typically cemented by calcium carbonate, iron oxide, silica, or hardened clay. Conglomerates form when rounded gravels deposited by water or glaciers become solidified and cemented by pressure over time. They can be found in sedimentary rock sequences of all ages but probably make up less than 1 percent by weight of all sedimentary rocks. They are closely related to sandstones in origin, and exhibit many of the same types of sedimentary structures, such as tabular and trough cross-bedding and graded bedding.Boggs, S. (2006) ''Principles of Sedimentology and Stratigraphy.'', 2nd ed. Prentice Hall, New York. 662 pp. Friedman, G.M. (2003) ''Classification of sediments and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allegheny Plateau
The Allegheny Plateau ( ) is a large dissected plateau area of the Appalachian Mountains in western and central New York, northern and western Pennsylvania, northern and western West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau. The plateau extends southward into western West Virginia, eastern Kentucky, and Tennessee, where it is instead called the Cumberland Plateau. The plateau terminates in the east at the Allegheny Mountains, which are the highest ridges just west of the Allegheny Front. The Front extends from central Pennsylvania through Maryland and into eastern West Virginia. The plateau is bordered on the west by glacial till plains in the north, generally north of the Ohio River, and the Bluegrass Region south of the Ohio River. Elevations vary greatly. In the glaciated Allegheny Plateau, relief may only reach one hundred feet or less. In the unglaciated Allegheny Plateau in southeastern Ohio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Geology Of The Genesee River
The Genesee River flows northward from its source in northern Pennsylvania to enter Lake Ontario at Rochester, New York. The present river valley has been modified extensively from preglacial river valleys. A lobe of the last glacier ( Wisconsonian) pushed southward almost to the Pennsylvania line, dramatically reshaping the drainage patterns of central and western New York. Middle Genesee The first image shows the evidence of the glacial rerouting for the middle section of the Genesee. The original river had two branches. The east branch runs southeast of Mount Morris. It was much larger than the west branch, flowing from near present-day Canisteo, New York to empty into the preglacial Ontario River (now lake) north of Rochester. The headwaters of the east branch were blocked and diverted southward into the present Susquehanna River system by huge glacial terminal moraines just south of Dansville. The entire old valley was buried in that area. This left only the small Canase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Letchworth State Park Upper Falls And Genesee Arch Bridge July 2022
Letchworth Garden City, commonly known as Letchworth, is a town in the North Hertfordshire district of Hertfordshire, England. It is noted for being the first garden city. The population at the time of the 2021 census was 33,990. Letchworth was an ancient parish, appearing in the Domesday Book of 1086. It remained a small rural village until the start of the twentieth century. The development of the modern town began in 1903, when much of the land in Letchworth and the neighbouring parishes of Willian and Norton was purchased by a company called First Garden City Limited, founded by Ebenezer Howard and his supporters with the aim of building the first "garden city", following the principles Howard had set out in his 1898 book, ''To-morrow: A Peaceful Path to Real Reform''. Their aim was to create a new type of settlement which provided jobs, services, and good housing for residents, whilst retaining the environmental quality of the countryside, in contrast to most industri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Morris Dam
The Mount Morris Dam is a concrete gravity dry dam on the Genesee River. It is located at the northern end of Letchworth State Park, south of Rochester, New York in the towns of Leicester and Mount Morris in Livingston County, New York. It is the largest dam of its type east of the Mississippi River and its purpose is to mitigate downstream flooding between Mount Morris and Lake Ontario. History The Mt. Morris Dam was built between 1948 and 1952 by the Buffalo District office of the U.S. Army Corps of Engineers (USACE). The project was authorized by the United States Congress in the Flood Control Act of 1944 at a cost of $25 million. Prior to the construction of the dam, the Genesee River Valley and the city of Rochester had experienced periodic flooding. The flood of 1865, which developed flows exceeding per minute, resulted in massive destructions with flows equating to half the flows of Niagara Falls. Severe floods occurred every seven years on average between 1865 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
