
	Where results make sense

Topic: Silverpit crater

	Silverpit crater - Wikipedia, the free encyclopedia
		The Silverpit crater is a sub-sea structure under the North Sea off the coast of the United Kingdom.
		Silverpit is named after the Silver Pit fishing grounds in which it is located.
		Allen P.J., Stewart S.A. "Silverpit: the morphology of a terrestrial multi-ringed impact structure".
	en.wikipedia.org /wiki/Silverpit_crater (1657 words)

	Geological Society - News - Britain gets its first crater (Site not responding. Last check: 2007-10-12)
		The Silverpit crater itself, named by Allen after the local fishing grounds, 140km East of the British coast, is around 3km across and 300m deep.
		Their formation can be explained by the response of a soft watery layer beneath the surface: the impact leaves a bowl-shaped cavity and as the soft layer moves inwards to fill the gap, it drags the brittle surface and cracks it.
		At Silverpit, which formed 60-65 million years ago in undersea chalk, it may be that the underlying layer of muddy shale was soft enough to flow in a similar way.
	www.geolsoc.org.uk /template.cfm?name=Silverpit (722 words)

	Shiva: Another K-T impact? :: Astrobiology Magazine ::
		These craters are not listed in the catalog because, despite the claims of their discoverers, they have not been independently confirmed to be the result of meteorite impacts.
		Doubt was cast on the impact origin of the Silverpit crater earlier this year, when it was reported in the journal Nature that Silverpit instead may be a sinkhole depression caused by salt withdrawal.
		One indication of an impact origin, he says, is that the floor of the Shiva crater is missing most of the lithosphere - the brittle outer shell of the Earth that includes the crust (the continents and the ocean floor) and the uppermost part of the mantle.
	www.astrobio.net /news/article1281.html (1658 words)

	Giant Crater Found Undersea - SciForums.com
		This crater is noteworthy because it is contemporary with the crater that struck the Yucatan southeast of the pyramids of Teotihuacan and the period when the dinosaurs went extinct.
		The crater has a cone-shaped peak at its center, which typically is found only in much larger craters, and is surrounded by a series of concentric rings.
		The meteor that formed the Silverpit crater hit Earth within roughly the same time period as the asteroid or meteor that is tied to the demise of the dinosaurs.
	www.sciforums.com /showthread.php?threadid=9826 (885 words)

	60M-Year-Old Meteor Crater Mapped In North Sea (Site not responding. Last check: 2007-10-12)
		Researchers believe the so-called Silverpit crater was formed after the catastrophic impact near Mexico's Yucatan Peninsula that scientists suspect contributed to the extinction of the dinosaurs.
		Silverpit's main crater is 1.5 miles (2.4 kilometers) wide with a central peak that probably formed when the Earth rebounded from the impact of the incoming cosmic projectile, scientists said.
		The Silverpit crater was identified by a pair of petroleum geoscientists reviewing seismic data collected 80 miles (130 kilometers) from the city of Hull in northeast England.
	www.freerepublic.com /focus/news/725356/posts (985 words)

	Silverpit Crater
		The first impact structure to be found in Britain; oil geologists stumbled across the ancient crater under the North Sea, 130 km east of England's Yorkshire coast.
		A tall conical central peak is buried inside the crater that is itself surrounded by a series of concentric rings which extend out a further 8 km in each direction.
		Its shape and size stand Silverpit apart from other craters in the inner Solar System and its closest relative appears to be the crater Valhalla on Jupiter's moon Callisto.
	www.daviddarling.info /encyclopedia/S/Silverpit_Crater.html (333 words)

	Silverpit
		The so-called Silverpit Crater, buried beneath the North Sea's rich oil and gas fields off England's eastern seaboard, measures 10 kilometers wide and sits beneath 36 meters of seawater and 270 meters of sediment.
		Silverpit's main crater is 2.4 kilometers wide with a central peak that probably formed when the Earth rebounded from the impact of the incoming cosmic projectile (isostasis).
		It is believed that Silverpit crater was formed after the catastrophic impact near Mexico's Yucatan Peninsula that contributed to the extinction of the dinosaurs.
	www.xs4all.nl /~carlkop/silverpe.html (577 words)

	Impact crater Summary
		An impact crater is a physical scar on a planetary body's surface (topographic depression or geological structure) that is the result of hypervelocity impact by a minor planet, such as an asteroid, comet, or meteorite.
		An impact crater (impact basin, astrobleme or sometimes crater) is a circular or oval depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the surface.
		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.
	www.bookrags.com /Impact_crater (5611 words)

	Aberdeen October Evening Meeting
		Crater scientists have been amazed by the quality of the seismic data, which allows the fine detail to be mapped in three dimensions - probably for the first time at any crater anywhere.
		Silverpit is buried by up to 1Km of Tertiary sediments which have preserved the fine detail of the structure.
		Silverpit may not rank among the planet's largest meteorite impacts, but it is certainly one of the most beautiful, and enigmatic.
	www.pesgb.org.uk /pesgb/S4/S4_abddec.asp?section=4 (799 words)

	Silverpit Crater -- AMIGA Astronomy
		The so-called Silverpit structure lies several hundred metres under the floor of the North Sea, about 130km east of the Yorkshire coast.
		Although nothing quite like Silverpit can be seen elsewhere on Earth or on the other inner planets, Stewart and Allen say the tight rings are a good match for those of impact craters on Jupiter's icy moons, such as Europa and Callisto.
		Silverpit was covered by a shallow sea back at the start of the Tertiary.
	www.voy.com /135010/215.html (776 words)

	Huge Impact Crater Found In North Sea
		Based on the frequency of asteroid impacts, the size of the North Sea and the age of the corresponding rocks, Stewart estimated that the chance of the area containing a small impact crater was one in two (Petroleum Geoscience, vol 5, p 273).
		Silverpit looks very similar to craters found on Europa and Callisto, which have similar systems of rings.
		At Silverpit, it may be that the underlying layer of muddy shale was soft enough to flow in a similar way, and finding evidence of that would help confirm the theory.
	www.colerandall.net /impact.htm (628 words)

	Geological Society - News - Doubt cast on Silverpit “crater” (Site not responding. Last check: 2007-10-12)
		Doubt has been cast upon the interpretation of the Silverpit “crater” as the result of an extraterrestrial bolide impact.
		The Silverpit crater lies in the core of one of two prominent synclines between three antiforms, each having a structural relief of 2km.
		Evidence for the supposed central peak of the crater (interpreted as further evidence of bolide origin) he believes is at best equivocal.
	www.geolsoc.org.uk /template.cfm?name=Silverpit2 (317 words)

	Geotimes - October 2002 - North Sea Crater
		Yet, while it resembles craters found elsewhere in the solar system, the newly discovered “Silverpit” crater is only one-tenth to one-hundredth the diameter.
		Stewart and Allen suggest that the crater’s structure reflects the material it hit: interbedded chalks and clays that lay beneath 50 to 300 meters of sea water.
		In search of the outcrop-scale features necessary to confirm that Silverpit is in fact an impact crater, Stewart and Allen inspected data from two drill cores taken from within the structure.
	www.agiweb.org /geotimes/oct02/NN_crater.html (884 words)

	Steve Quayle News Alerts
		Researchers say the 12-mile-wide, multiringed crater is 60 million to 65 million years old — going back to the end of the dinosaur era — and looks more like impact craters on moons of Jupiter than anything seen on Earth.
		He had already published research suggesting that impact craters might be detected beneath the North Sea’s floor, where the overlying layers of sediment would preserve structures from the erosion that tends to erase impact craters on land.
		The researchers’ estimates put the Silverpit Crater in roughly the same time frame as the Chicxulub impact in Mexico that many scientists think sparked the demise of the dinosaurs 65 million years ago.
	stevequayle.com /News.alert/Strange_Stuff/020731.crater.in.UK.sea.html (747 words)

	Unique meteorite crater found under North Sea - 31 July 2002 - New Scientist
		An impact crater has been found off the shores of the UK - but it is like nothing else on Earth.
		The newly discovered crater, named Silverpit after the local fishing grounds, is 140 kilometres off the east coast of Britain (see graphic).
		An asteroid between 200 and 500 metres across must have caused the crater, which is around three kilometres across and 300 metres deep, when it crash-landed between 60 and 65 million years ago.
	www.newscientist.com /article.ns?id=dn2622 (627 words)

	Scientists Map Ancient Crater - DiscussAnything.com -
		The impact crater, buried beneath the North Sea's rich oil and gas fields off England's eastern seaboard, measures about six miles wide and sits beneath 120 feet of seawater and more than 900 feet of sediment.
		Silverpit's main crater is 1.5 miles wide with a central peak that probably formed when the Earth rebounded from the impact of the incoming cosmic projectile, scientists said.
		The Silverpit crater was identified by a pair of petroleum geoscientists reviewing seismic data collected 80 miles from the city of Hull in northeast England.
	www.discussanything.com /forums/showthread.php?t=12464 (376 words)

	Scientific American: Ancient Crater Discovered Beneath the North Sea (Site not responding. Last check: 2007-10-12)
		Dubbed the Silverpit crater, it lies under 40 meters of water and a few hundred meters of sediments.
		Silverpit is thus unusual in that it is both relatively small and it has a multi-ring structure previously seen only in craters with diameters of at least 250 kilometers.
		But the case for Silverpit being an impact-generated feature (as opposed to the result of some geological process) is not closed yet.
	www.sciam.com /print_version.cfm?articleID=0006699E-2F20-1D48-90FB809EC5880000 (380 words)

	Unusually Well Preserved Crater Found in North Sea (Site not responding. Last check: 2007-10-12)
		The crater, consisting of a central crater surrounded by ten concentric rings of escarpments, is 20 kilometers (12 miles) wide.
		Stewart said that the undersea crater discovery was "an accident." While Allen was examining seismic data in search of gas fields, Stewart explained, "he noticed out of the corner of his eye some anomalous features" in the shallower layers of the seafloor.
		This means the crater was formed between 60 and 65 million years ago, near the end of the age of the dinosaurs.
	news.nationalgeographic.com /news/2002/07/0731_020731_crater.html (812 words)

	Google Earth Hacks - File Downloads - Craters
		This a recently found large crater in Antarctica, that was created by a 50 kilometres wide space rock 250 million years ago, and contributed to, or caused the Permian-Triassic extinction, the greatest mass extinction on Earth.
		The crater is oval in shape because of the east-west geological compression that the area...
		The Silverpit crater in the North Sea was discovered in 2002 during a seismic oil exploration.
	www.googleearthhacks.com /dlcat34/Craters.htm (1174 words)

	KT-Boundary - EvoWiki (Site not responding. Last check: 2007-10-12)
		This structure, the Chicxulub crater, was dated with the 40Ar/39Ar radiometric dating method as being 65 million years old right at the K/T boundary.
		Calculations based on the size of the crater were consistent with a large meteorite impact as proposed by Alvarez.
		Two other craters, the Boltysh crater in the Ukraine and the Silverpit crater in the North Sea, also appear to have been formed at the K/T boundary.
	wiki.cotch.net /index.php/KT-Boundary (964 words)

	Cretaceous-Tertiary extinction event Summary
		This was not a lethal blow to the theory; although the crater resulting from the impact would have been 150 to 200 kilometres in diameter, Earth's geological processes tend to hide or destroy craters over time.
		The discovery by Alan R. Hildebrand and Glen Penfield of the Chicxulub Crater buried under Chicxulub in the Yucatan as well as various types of debris in North America and Haiti have lent credibility to this theory.
		Several paleontologists remained skeptical about the impact theory, as their reading of the fossil record suggested that the mass extinctions did not take place over a period as short as a few years, but instead occurred gradually over about ten million years, a time frame more consistent with longer term events such as massive volcanism.
	www.bookrags.com /Cretaceous-Tertiary_extinction_event (3534 words)

	BBC NEWS \| Science/Nature \| North Sea crater shows its scars
		The Silverpit chalk structure is deep under the sea bed
		The so-called Silverpit structure lies several hundred metres under the floor of the North Sea, about 130km (80 miles) east of the Yorkshire coast.
		For their part, Allen and Stewart - who first reported Silverpit's features in 2002 - hope their latest assessment of seismic reflection maps will go a long way to silencing the doubts.
	news.bbc.co.uk /1/hi/sci/tech/4360815.stm (878 words)

	Unique Facts about Mexico: Chicxulub Crater (Site not responding. Last check: 2007-10-12)
		Chicxulub Crater is an ancient impact crater buried underneath the Yucatan peninsula, with its center located approximately underneath the town of Chicxulub, Yucatán, Mexico.
		He and his faculty adviser William V. Boynton published the results of the research in the scientific press, suggesting not only that the deposits were the result of an Earth impact, but that the impact couldn't have been more than 1,000 kilometers (620 miles) away.
		Indeed, some evidence has accumulated that the actual crater is 300 kilometers (186 miles) wide, and the 180 kilometer ring is just an inner wall.
	www.sheppardsoftware.com /Mexicoweb/factfile/Unique-facts-Mexico4.htm (1162 words)

	SPACE.com -- Study: Newfound Crater Under North Sea Carved by Asteroid
		Impact craters are often not visible on Earth's surface, because over time older ones are folded into the planet by shifting tectonic plates.
		The newfound structure, named Silverpit, is centered about 80 miles (130 km) off the east coast of Britain near the Humber estuary, which is north of London and near Hull.
		Assuming the crater was carved by an asteroid, or possibly a comet, Stewart estimates the rock would have been a bit wider than a football field is long.
	www.space.com /scienceastronomy/newfound_crater_020731.html (899 words)

	THE SHIVA CRATER: IMPLICATIONS FOR DECCAN VOLCANISM, INDIA-SEYCHELLES RIFTING, DINOSAUR EXTINCTION, AND PETROLEUM ...
		Among these, the submerged Shiva crater is the largest—about 600 km long and 400 km wide—and has proved to be a rich source of oil and gas.
		The age of the crater is inferred from its brecciated Deccan lava floor and the overlying Paleocene sediments within the basin, isotopic dating of the presumed ejecta melt, and the magnetic anomaly of the Carlsberg Ridge.
		The synchroneity of the Deccan Traps with the KT boundary, their geographic proximity with the crater, and the occurrence of a thick shocked quartz layer below the lowermost lava flow strongly imply that the Deccan volcanism may have been triggered by the Shiva impact.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_58126.htm (518 words)

Try your search on: Qwika (all wikis)