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List Of Impact Structures On Earth
This list of impact structures on Earth contains a selection of the 190 confirmed craters given in the Earth Impact Database as of 2017. To keep the lists manageable, only the largest impact structures within a time period are included. Alphabetical lists for different continents can be found under Impact structures by continent below. Confirmed impact structures listed by size and age These features were caused by the collision of meteors (consisting of large fragments of asteroids) or comets (consisting of ice, dust particles and rocky fragments) with the Earth. For eroded or buried craters, the stated diameter typically refers to the best available estimate of the original rim diameter, and may not correspond to present surface features. Time units are either in ka (thousands) or Ma (millions) of years. 10 ka or less Less than ten thousand years old, and with a diameter of or more. The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Impact Structure
An impact structure is a generally circular or craterlike geologic structure of deformed bedrock or sediment produced by impact on a planetary surface, whatever the stage of erosion of the structure. In contrast, an impact crater is the surface expression of an impact structure. In many cases, on Earth, the impact crater has been destroyed by erosion, leaving only the deformed rock or sediment of the impact structure behind.Neuendorf, K.K.E., J.P. Mehl Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. This is the fate of almost all old impact craters on Earth, unlike the ancient pristine craters preserved on the Moon and other geologically inactive rocky bodies with old surfaces in the Solar System. Impact structure is synonymous with the less commonly used term astrobleme meaning "star wound". In an impact structure, the typical visible and topographic expressions of an impact crater are no long ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campo Del Cielo
Campo del Cielo refers to a group of iron meteorites and the area in Argentina where they were found. The site straddles the provinces of Chaco and Santiago del Estero, located north-northwest of Buenos Aires, Argentina and approximately southwest of Asunción, Paraguay. The crater field covers and contains at least 26 craters, the largest being . The craters are estimated to be four to five thousand years old. They were reported to the general public in 1576, but were already well-known by aboriginal peoples. The craters and surrounding areas contain many fragments of an iron meteorite. In total, approximately 100 tonnes of fragments have been recovered, the most of any meteorite find. The two largest fragments, the 30.8-tonne '' Gancedo'' and 28.8-tonne ''El Chaco'', are among the heaviest single-piece meteorite masses recovered on Earth, following the 60-tonne Hoba meteorite and a 31-tonne fragment of the Cape York meteorite. History In 1576, the governor of a provi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeolian Processes
Aeolian processes, also spelled eolian, pertain to wind activity in the study of geology and weather and specifically to the wind's ability to shape the surface of the Earth (or other planets). Winds may erode, transport, and deposit materials and are effective agents in regions with sparse vegetation, a lack of soil moisture and a large supply of unconsolidated sediments. Although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as deserts. The term is derived from the name of the Greek god Aeolus, the keeper of the winds. Definition and setting ''Aeolian processes'' are those processes of erosion, transport, and deposition of sediments that are caused by wind at or near the surface of the earth. Sediment deposits produced by the action of wind and the sedimentary structures characteristic of these deposits are also described as ''aeolian''. Aeolian processes are most important in areas where there is little ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macha Crater
Macha (Russian: Мача) is a field of five meteorite craters located 685 kilometers (425 miles) northeast of Yakutsk in the Sakha Republic in Siberia, Russia, ranging from in diameter. The two largest craters form the pear-shaped Abram Lake while the remaining three are located to the north. They have been very well preserved. The craters are the result of the fall of possible iron meteorites at approximately 5300 BCE (Holocene), which would give them an age of about 7,300 years. See also *List of impact craters on Earth This list of impact craters on Earth contains a selection of the 190 confirmed craters given in the Earth Impact Database as of 2017. To keep the lists manageable, only the largest craters within a time period are included. Alphabetical lists f ... References External linksCruzio crater list [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilumetsa Crater
Ilumetsa is a set of two probable meteorite craters in Estonia Estonia, formally the Republic of Estonia, is a country by the Baltic Sea in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the sea across from Sweden, to the south by Latvia, and t .... The Ilumetsa site is located in south eastern Estonia and it consists of two structures, located 725 m from each other. Their diameters are: 75–80 m and ~50 m. Their true depths are about 8 and 3.5 m, respectively. Both structures are surrounded by a rim up to a few meters high: the rims are highest in their eastern parts with maximum rim heights of Ilumetsa Large 4.5 m and 1.5 m for Ilumetsa Small. The Large Ilumetsa structure has been dated by measuring 14C gyttja and peat from the very bottom of the crater shaped depression. The lowermost organic beds were dated to 6030 +/-100 14C years (7170– 6660 cal. years BP). Recent 14C dating charcoals buried within as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boxhole Crater
Boxhole is a young impact crater located approximately 180 km (265 km by road) north-east of Alice Springs in the Northern Territory, Australia. It is 170 metres in diameter and its age is estimated to be 5,400 ± 1,500 years based on the cosmogenic 14C terrestrial age of the meteorite, placing it in the Holocene. The crater is exposed to the surface. Description In 1937 Joe Webb, a shearer at Boxhole sheep station, took geologist Cecil Madigan to examine the crater. Madigan discovered nickel-bearing metallic fragments and iron shale-balls similar to those found at Henbury Henbury is a suburb of Bristol, England, approximately north west of the city centre. It was formerly a village in Gloucestershire and is now bordered by Westbury-on-Trym to the south; Brentry to the east and the Blaise Castle Estate, Blaise H ... to the south of Alice Springs. It was the second impact crater to be described in Australia, after Henbury. A later search found additional meteoritic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whitecourt Crater
Whitecourt crater is a meteorite impact crater in central Alberta, Canada, located approximately southeast of the Town of Whitecourt within Woodlands County. It is remarkable for being unusually well-preserved for a crater of small size and relatively young age. The crater is approximately in diameter and deep, and its age is estimated to be between 1,080 and 1,130 years since the buried fragments of the impacting meteorite are all found above a layer of carbon from a forest fire dating around 1,100 years ago. The crater was found by Sonny Stevens, a resident of Whitecourt, on July 3, 2007. Stevens was hunting in the area, and later found the first fragments of the meteorite while metal detecting on the crater rim. The meteoritic nature of the fragments, and thus the authenticity of the crater, were confirmed by Dr. Chris Herd, professor of Earth and Atmospheric Sciences at the University of Alberta. The area has been placed within a 200-metre by 200-metre protected zone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wabar Crater
The Wabar craters are impact craters located in Saudi Arabia first brought to the attention of Western scholars by British Arabist, explorer, writer and Colonial Office intelligence officer St John Philby, who discovered them while searching for the legendary city of Ubar in Arabia's Rub' al Khali ("Empty Quarter") in 1932. The expeditions 1932 Philby The vast desert wasteland of southern Saudi Arabia known as the Empty Quarter, or '' Rub' al Khali'' in Arabic, is one of the most desolate places on Earth. In 1932, Harry St John "Jack" Philby was hunting for a city named Ubar, that the Quran describes being destroyed by God for defying the Prophet Hud. Philby transliterated the name of the city as Wabar. Philby had heard of Bedouin legends of an area called ''Al Hadida'' ("place of iron" in Arabic) with ruins of ancient habitations, and also an area where a piece of iron the size of a camel had been found, and so organized an expedition to visit the site. After a month ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaali Main Crater On 2005-08-10
Kaali may refer to: * Kali or Kaali, Hindu goddess *Kaali, Estonia, village in Saaremaa Parish, Saare County, Estonia ** Kaali crater, group of meteorite craters in Kaali *4227 Kaali, asteroid, named after Kaali crater * ''Kaali'' (1980 film), a film by I. V. Sasi shot simultaneously in Tamil and Telugu * ''Kaali – Ek Agnipariksha''; Indian TV series (2010–2011) * ''Kaali – Ek Punar Avatar ''Kaali – Ek Punar Avatar'' is an Indian soap opera which aired on Star Plus from 3 December 2012 to 8 March 2013. The story was based on the famous Nitish Katara murder case where a mother fights and gets justice for her son. Before premier ...''; Indian TV series (2012–2013) * ''Kaali'' (2018 film), 2018 Tamil film See also * Kali {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macha Craters Overview Map
Macha () was a sovereignty goddess of ancient Ireland associated with the province of Ulster, particularly the sites of Navan Fort (''Eamhain Mhacha'') and Armagh (''Ard Mhacha''), which are named after her.Koch, John T. ''Celtic Culture: A Historical Encyclopedia''. ABC-CLIO, 2006. p. 1231 Several figures called Macha appear in Irish mythology and folklore, all believed to derive from the same goddess. She is said to be one of three sisters known as ' the three Morrígna'. Like other sovereignty goddesses, Macha is associated with the land, fertility, kingship, war and horses.Mac Cana, Prionsias.The Goddesses of the Insular Celts. ''Celtic Mythology''. Hamlyn, 1970. Proinsias Mac Cana discusses three Machas: Macha wife of Nemed, Queen Macha wife of Cimbáeth, and Macha wife of Crunnchu who caused the debility of the Ulstermen. Gregory Toner discusses four, with the addition of Macha Mong Ruad. Etymology and alias The name is presumably derived from Proto-Celtic *''makajā'' d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
