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Topic: Rio Cuarto craters

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	Rio Cuarto
		Aldahan, A.A. Koeberl, C., Göran Possnert, G. and Schultz, P. 1997 10Be and chemistry of impactites and target materials from the Rio Cuarto crater field, Argentina: Evidence for surficial cratering and melting.
		Bunch, T.E. Schultz, P.H. 1992 A study of the Rio Cuarto loess impactites and chondritic impactor (abstract).
		Koeberl, C. Schultz, P.H. 1992 Chemical composition of meteoritic and impactite samples from the Rio Cuarto Craters, Argentina (abstract).
	www.unb.ca /passc/ImpactDatabase/images/rio-cuarto.htm (486 words)

	Impact crater - Wikipedia, the free encyclopedia
		An impact crater (impact basin or sometimes crater) is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteorite) with the surface.
		In the center of craters on Earth a crater lake often accumulates, and a central island or peak (caused by rebounding crustal rock after the impact) is usually a prominent feature in the lake.
		Few underwater craters have been discovered because of the difficulty of surveying the sea floor; the rapid rate of change of the ocean bottom; and the subduction of the ocean floor into the Earth's interior by processes of plate tectonics.
	en.wikipedia.org /wiki/Impact_crater (2005 words)

	Learn more about Crater in the online encyclopedia. (Site not responding. Last check: 2007-11-03)
		Craters are typically caused by meteorite impacts, although some are caused by volcanic activity (see volcano for more on these).
		In the center of craters on Earth a crater lake often accumulates, and in craters formed by meteorites a central island (caused by rebounding crustal rock after the impact) is usually a prominent feature in the lake.
		Few underwater craters have been discovered because of the difficulty of surveying the sea floor; the rapid rate of change of the ocean bottom; and the "subduction" of the ocean floor into the Earth's interior by processes of continental drift.
	www.onlineencyclopedia.org /c/cr/crater.html (1220 words)

	Crater (Site not responding. Last check: 2007-11-03)
		A crater (basin or impact crater) is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body.
		Craters are caused by meteorite impacts or electrical discharge, although some are caused by volcanic activity (see volcano for more details), or karstic erosion (see Karst Crater for more details).
		Daniel Barringer was one of the first to identify a geological structure as an impact crater, the Barringer Meteorite Crater (or the "Meteor Crater") in Arizona, but at the time his ideas were not widely accepted, and when they were, there was no recognition of the fact that Earth impacts are common in geological terms.
	hallencyclopedia.com /Crater (1926 words)

	Crater
		A crater (basin or impact crater) is a circular depression on the surfaceof a planet, moon, asteroid, or other celestial body.
		In the center of craters on Earth a crater lake often accumulates, and in craters formed bymeteorites a central island (caused by rebounding crustal rock after the impact) isusually a prominent feature in the lake.
		Few underwater craters have been discovered because of the difficulty of surveying the seafloor; the rapid rate of change of the ocean bottom; and the subduction of theocean floor into the Earth's interior by processes of continentaldrift.
	www.therfcc.org /crater-32464.html (1049 words)

	Rio Cuarto craters
		The Rio Cuarto craters are a group of depressions located in Argentina at lattitude S 32° 52', longitude W 64° 14' There is currently some controversy as to whether these structures are actually produced by impacts, or by aeolian surficial processes, which form many similar features in that region.
		The craters were clearly due to a grazing impact of a set of objects at a very low angle, which calculations show to be a rare occurrence.
		Models of the Rio Cuarto event suggest that the object struck at an angle of no more than 15 degrees from the horizontal, with the impact itself having 10 times more explosive energy than the Barringer Crater event and 30 times more than the Tunguska event.
	www.fastload.org /ri/Rio_Cuarto_craters.html (656 words)

	SkyandTelescope.com - News from Sky & Telescope - Unique Crater Swarm Disputed
		For the last decade planetary scientists have considered a cluster of large, elongated pits near Rio Cuarto to be unique impact craters, gouged by a chunk of asteroid that glanced obliquely through the atmosphere and broke into pieces just before striking the Earth.
		The Pampean plain near Rio Cuarto in northern Argentina bears elongated scars (left) that are thought to be unique craters from an oblique impact several thousand years ago.
		This would suggest that the Rio Cuarto craters are not craters at all but rather long hollows carved and shaped over thousands of years by prevailing winds.
	www.skyandtelescope.com /news/3306051.html?page=1&c=y (653 words)

	Learn more about Impact event in the online encyclopedia. (Site not responding. Last check: 2007-11-03)
		Based on crater formation rates determined from the Earth's closest celestial partner, Luna, astronomers have determined that during the last 600 million years the Earth has been struck by 60 objects larger than 5 kilometers or more across.
		Probably the most convincing evidence for a worldwide catastrophe was the discovery of the crater which has since been named Chicxulub Crater.
		A particularly interesting fireball was observed moving north over the Rocky Mountains from the US Southwest to Canada on August 10 1972, and was filmed by a tourist at the Grand Teton National Park in Wyoming with an 8-millimeter color movie camera.
	www.onlineencyclopedia.org /i/im/impact_event.html (1496 words)

	4Reference \|\| Crater (Site not responding. Last check: 2007-11-03)
		Crater (the cup) is one of the 88 modern constellations and was also one of the 48 listed by Ptolemy.
		It is said to represent the goblet of Apollo.
		Craters are typically caused by meteorite impacts, although some are caused by volcanic activity.
	www.4reference.net /encyclopedias/wikipedia/Crater.html (1174 words)

	Wabar craters (Site not responding. Last check: 2007-11-03)
		The largest fragment was recovered in 1965 visit to Wabar and weighs 2.2 It is known as the "Camel's Hump" is on display at the King Saud University in Riyadh.
		The sand was turned into fl glass the craters and pellets of the glass scattered all over the area decreasing in with distance from the craters due to The glass is about 90% local sand 10% meteoritic iron and nickel.
		The layout of the impact area suggests the body fell at a shallow angle was moving at typical meteorite entry speeds 40 000 to 60 000 km/h.
	www.freeglossary.com /Wabar_craters (1072 words)

	Crater - Wikipedia, the free encyclopedia
		Look up crater on Wiktionary, the free dictionary.
		Impact crater, a meteorite impact with another body can cause an
		Subsidence crater, from an underground explosion (usually nuclear)
	en.wikipedia.org /wiki/Crater (104 words)

	What Caused Argentina's Mystery Craters? (Site not responding. Last check: 2007-11-03)
		But from the perspective of the satellite it became clear that the "craters" weren't craters at all—like sand dunes, they had been produced by the action of wind on soil and vary in their orientation according to the direction of local prevailing winds.
		The meteorites that Schultz found inside the bogus craters, Bland's team further concludes, are once-buried remnants of ancient impacts that became exposed when the wind carved out the depressions.
		But Bland and his researchers have yet to identify a crater produced by that impact, and they don't even know the full scale of the tektite field, since they haven't yet found its edge.
	news.nationalgeographic.com /news/2002/05/0509_020509_glassmeteorite_2.html (585 words)

	Rio Cuarto craters (Site not responding. Last check: 2007-11-03)
		The craters were thought to be due to a grazing impact of a set of objects at a very low angle, which calculations show to be a rare occurrence.
		It is likely the impact resulted in serious atmospheric effects and may have even had a short-term effect on global climate.
		Abstract: Ten oblong aligned depressions in the Río Cuarto area (provincia de Córdoba, Argentina) were supposed to be the result of very-low-angle Holocene meteoroid impacts.
	www.sciencedaily.com /encyclopedia/rio_cuarto_craters (813 words)

	Eight Little Craters All In A Row
		Such have been spotted on the moon, and it is unlikely the earth escaped such bar rages.
		Of course, older terrestrial craters are harder to identify due to the ceaseless geological activity here on earth.
		The craters are all roughly the same age: 310-330 million years.
	www.science-frontiers.com /sf105/sf105p09.htm (287 words)

	Jarmo Moilanen´s WWW-site - List of probable Impact craters
		All of these layers are in matter of fact quite well confirmed and I'm thinking of moving these in my main list of Impact structures of the World.
		Unlike typical impact structures, origin of these layers are not known and the original impact structure may have be even other side of the planet today.
		The next list of probable and possible impact structures from X-SAR images is based on "Meteoric craters discovery by means of X-SAR images examination" -articles (2 parts) by Roberto Gorelli, who kindly posted the article to me. Article has been published in IMO's WGN.-magazine.
	www.somerikko.net /old/geo/imp/possible.htm (3924 words)

	Middle East Open Encyclopedia: Impact crater (Site not responding. Last check: 2007-11-03)
		This is an extract from The Middle East Open Encyclopedia, made possible through the Wikimedia Foundation.
		Iraq Museum International always displays the most recent published revision of the source article, Impact crater; all previous versions may be viewed here.
		They link directly to authoring tools for you to start writing a particular article.
	www.baghdadmuseum.org /ref/index.php?title=Impact_crater (2137 words)

	What Caused Argentina's Mystery Craters? (Site not responding. Last check: 2007-11-03)
		The mysterious craters in Argentina may not have been caused by meteorites at all, but rather by the wind, sculpting the ground over a long time.
		Citing evidence presented by Philip A. Bland in the same issue of the journal, Melosh describes a newly emerging picture, in which a much older meteorite collision blasted tons of sandy, local soil into the air—melting it instantly and peppering a vast swath of country with glowing, glassy debris.
		What's more, it seemed, the craters all ran parallel to each other, as though a low-flying herd of Dumbos had dragged their feet along the ground beneath them.
	news.nationalgeographic.com /news/2002/05/0509_020509_glassmeteorite.html (611 words)

	Meteorite Impact Craters
		A quick look at the chart below shows that almost all the 10+ meter craters dated within the last 50,000 years have meteorite fragments associated with them.
		It appears the Macha, Russia crater would be a prime target for investigation.
		I have rated availability based solely on my judgment of availability and presence in major institutional collections.
	www.star-bits.com /impact-craters.htm (86 words)

	crateras de meteoritos no Brasil brazilian craters
		Próximo ao rio Curuçá, no Alto Solimões Amazonas.
		De todas as crateras de impacto na América do Sul, o Domo de Araguainha é a maior delas, possivelmente a mais antiga e a que foi submetida a estudos geológicos mais detalhados.
		PILKINGTON, M., and GRIEVE, R. The geophysical signature of terrestrial impact craters.
	rgregio.astrodatabase.net /crateras_meteoritos_brasil.htm (1407 words)

	Cambridge Conference Correspondence
		Rio Cuarto to be unique impact craters, gouged by a chunk of asteroid that
		Rio Cuarto event must have occurred within the past several thousand years.
		craters, and they're all the same class of chondritic stone.
	abob.libs.uga.edu /bobk/ccc/cc051702.html (6416 words)

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