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Calvin Crater
Calvin is an impact crater located in Calvin Township, Cass County in the U.S. state of Michigan. It was discovered in 1987 by Randall Milstein of the Michigan Geological Survey while examining data from about 100 test wells drilled in the area. It is 5 miles (8.5 km) in diameter and the age is estimated to be 450 ± 10 million years (Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...). The crater is not exposed to the surface. It lies about 100 to 400 feet (30–120 m) below today's ground level. References External linksExploration of the Calvin impact structure Landforms of Cass County, Michigan Impact craters of the United States Landforms of Michigan Ordovician impact craters {{CassCountyMI-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Impact Crater
An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain. Lunar impact craters range from microscopic craters on lunar rocks returned by the Apollo Program and small, simple, bowl-shaped depressions in the lunar regolith to large, complex, multi-ringed impact basins. Meteor Crater is a well-known example of a small impact crater on Earth. Impact craters are the dominant geographic features on many solid Solar System objects including the Moon, Mercury, Callisto, Ganymede and most small moons and asteroids. On other planets and moons that experience more active surface geological processes, such as Earth, Venus, Europa, Io and Titan, visible impact craters are less common because they become ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calvin Township, Michigan
Calvin Township is a civil township of Cass County in the U.S. state of Michigan. The population was 2,037 at the 2010 census. History Calvin Township's first public school was built in 1834. Calvin Township was organized in 1835 and named for Calvin Britain who represented Cass County in the state legislature. Calvin Township along with Cass County generally was part of the Underground Railroad. In 1850 Calvin Township's population was 25.3% African-American.Ernestine K. Enomoto and David L. Angus. "African American School Attendance in the 19th Century: Education in a Rural Northern Community, 1850-1880" in ''The Journal of Negro Education'', Vol. 64, No. 1 (Winter, 1995), pp. 42-51 Geography According to the United States Census Bureau, the township has a total area of , of which is land and , or 3.41%, is water. Calvin Township is the location of the Calvin impact crater. Communities *Brownsville began with a gristmill built by Pleasant Grubb in 1831. It was located at th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cass County, Michigan
Cass County is a county in the U.S. state of Michigan. As of the 2020 Census, the population was 51,589. Its county seat is Cassopolis. Cass County is included in the South Bend– Mishawaka, IN-MI, Metropolitan Statistical Area which has a total population of 316,663 and is considered part of the Michiana region. History The county is named for Lewis Cass, the Michigan Territorial Governor at the time the county was created in 1829. Cass later served as the United States Secretary of War under President Andrew Jackson, thus making a case for including Cass County as one of Michigan's "cabinet counties". Cass County was not as heavily forested and had more fertile prairie land than other nearby areas of Michigan. During early settlement, it attracted numerous settlers who wanted to farm and grew more rapidly in population. The county quickly developed industry as well. As early as 1830, a carding mill was started in the county on Dowagiac Creek, a branch of the St. Joseph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michigan
Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and the largest by area east of the Mississippi River.''i.e.'', including water that is part of state territory. Georgia is the largest state by land area alone east of the Mississippi and Michigan the second-largest. Its capital is Lansing, and its largest city is Detroit. Metro Detroit is among the nation's most populous and largest metropolitan economies. Its name derives from a gallicized variant of the original Ojibwe word (), meaning "large water" or "large lake". Michigan consists of two peninsulas. The Lower Peninsula resembles the shape of a mitten, and comprises a majority of the state's land area. The Upper Peninsula (often called "the U.P.") is separated from the Lower Peninsula by the Straits of Mackinac, a channel tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Randall Milstein
Randall may refer to the following: Places United States *Randall, California, former name of White Hall, California, an unincorporated community * Randall, Indiana, a former town *Randall, Iowa, a city *Randall, Kansas, a city * Randall, Minnesota, a city * Randall, West Virginia, an unincorporated community *Randall, Wisconsin, a town * Randall, Burnett County, Wisconsin, an unincorporated community *Randall County, Texas * Randall Creek, in Nebraska and South Dakota *Randall's Island, part of New York City *Camp Randall, Madison, Wisconsin, a former army camp, on the National Register of Historic Places * Fort Randall, South Dakota, a former military base, on the National Register of Historic Places Elsewhere * Mount Randall, Victoria Land, Antarctica * Randall Rocks, Graham Land, Antarctica *Randall, a community in the town of New Tecumseth, Ontario, Canada Businesses *Randall Amplifiers, a manufacturer of guitar amplifiers *Randall House Publications, American publisher * Ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michigan Geological Survey
The Michigan Geological Survey is a scientific agency of the U.S. state of Michigan. The survey is headed by the State Geologist of Michigan. The survey has been composed of three individual surveys: the first from 1837 through 1845, the second from 1859 through 1862, and the third from 1869 to present. During most of that time, the survey has been a department of the state government. Since 2011 however, the survey has been administered by the Department of Geosciences at Western Michigan University. History First and second geological surveys On January 26, 1837, Michigan was admitted as a state. On that same day, a bill was introduced and approved in the state legislature to conduct a geological survey of Michigan. Dr. Douglass Houghton, who created and planned the survey, convinced legislators to approve its creation and funding. The bill, titled "An act to provide for a geological survey of the state", was signed into law by Governor Stevens T. Mason on February 23, commenci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the 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 beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed 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 period of the Paleozoic Era by the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Cass County, Michigan
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features. Mountains, hills, plateaux, and plains are the fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Impact Craters Of The United States
Impact may refer to: * Impact (mechanics), a high force or shock (mechanics) over a short time period * Impact, Texas, a town in Taylor County, Texas, US Science and technology * Impact crater, a meteor crater caused by an impact event * Impact event, the collision of a meteoroid, asteroid or comet with Earth * Impact factor, a measure of the citations to a science or social science journal Books and magazines * ''Impact'' (novel), a 2010 novel by Douglas Preston *''Impact Press'', a former Orlando, Florida-based magazine * Impact Magazines, a former UK magazine publisher * ''Impact'' (conservative magazine), a British political magazine * ''Impact'' (British magazine), a British action film magazine * ''Impact'', a French action film magazine spun off from ''Mad Movies'' * ''Impact'' (UNESCO magazine), a former UNESCO quarterly titled ''IMPACT of science on society'' * ''Impact'' (student magazine), a student magazine for the University of Nottingham, England * ''Bathim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Michigan
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, Stratum, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Althoug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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