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Topic: Nectaris Basin

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	Kids.Net.Au - Encyclopedia > Mare Nectaris (Site not responding. Last check: 2007-10-10)
		Mare Nectaris (the "sea of nectar") is a lunar mare located within the Nectaris basin on the lunar nearside.
		The basin material is of the Nectarian[?] and Lower Imbrian[?] epochs, with the mare material of the Upper Imbrian[?] epoch.
		The crater Theophilus[?] on the northeastern side of the mare is of the Eratosthenian[?] epoch.
	www.kids.net.au /encyclopedia-wiki/ma/Mare_Nectaris (135 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-10)
		Nectaris is a multi-ring impact basin that formed on the near side of the Moon, and its ejecta blanket serves as a useful stratigraphic marker.
		The Nectarian period encompasses all events that occurred between the formation of the Nectaris and Imbrium impact basins.
		The age of the Orientale basin has not been directly determined, though it must be older than 3.72 Ga (based on Upper Imbrian ages of mare basalts) and could be as old as 3.84 Ga based on the size-frequency distributions of craters superposed on Orientale ejecta.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Lunar_geologic_timescale (1232 words)

	Mare Fecunditatis - Wikipedia, the free encyclopedia
		The Fecuditatis basin formed in the Pre-Nectarian epoch, while the basin material surrounding the mare is of the Nectarian epoch.
		The mare matierial is of the Upper Imbrian epoch and is relatively thin compared to Mare Crisium or Mare Tranquillitatis.
		This basin is overlapped with the Nectaris, Tranquillitatis, and Crisium basins.
	en.wikipedia.org /wiki/Mare_Fecunditatis (227 words)

	Apollo 16 Lunar Samples Overview
		Nectaris is the nearest large impact basin, a distance of less than 200 kilometers from the basin rim to the landing site.
		One interpretation is that the older Descartes Formation is related to Nectaris basin ejecta and that the slightly younger Cayley Formation is related to Imbrium basin ejecta.
		This is believed to be the age of the Nectaris basin-forming impact.
	www.lpi.usra.edu /expmoon/Apollo16/A16_sampact.html (874 words)

	Palaeos Hadean: The Nectarian Era
		The Nectarian Era is named for the Mare Nectaris ("Sea of Nectar"), an old basin on the southwest part of the lunar Nearside.
		The current "best guess" is that these objects were derived from the breakup of one or more large planetoids in the asteroid belt, a result of tidal stresses caused by a close approach to Jupiter, or during the outward migration of Saturn.
		The basins of Nectarian age are the oldest surviving basins on the moon.
	www.palaeos.com /Hadean/Nectarian.html (211 words)

	Lunar Orbiter: Impact Basin Geology
		The Cordillera Mountains are regarded as the rim of the basin, defining the basin's 930-kilometer diameter.
		The Imbrium Basin is the largest basin on the nearside of the Moon, with a diameter of 1160 kilometers (the South Pole-Aitken Basin on the farside is twice as large).
		Material ejected by the formation of an impact basin is generally redeposited in the region outside the basin.
	www.lpi.usra.edu /expmoon/orbiter/orbiter-basins.html (1487 words)

	Learn more about Mare Nectaris in the online encyclopedia. (Site not responding. Last check: 2007-10-10)
		Mare Nectaris (the "sea of nectar") is a lunar mare located within the Nectaris basin on the lunar nearside.
		The basin material is of the Nectarian and Lower Imbrian epochs, with the mare material of the Upper Imbrian epoch.
		The crater Theophilus on the northeastern side of the mare is of the Eratosthenian epoch.
	www.onlineencyclopedia.org /m/ma/mare_nectaris.html (209 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		The youngest basins are surrounded by blankets of radially lineated ejecta and clusters of secondary impact craters (province by).
		The near-side terrain traversed by the profiles is composed mostly of basin-related terra provinces and maria; the higher far-side terrain consists of the cratered terra province overlain by one younger, plains-filled basin (Mendeleev).
		Basin materials are assigned ages according to whether they are believed to have been thoroughly fragmented and redeposited by the impact or merely dis- placed in more or less coherent masses by uplift or horizontal thrusting.
	astrogeology.usgs.gov /Projects/PlanetaryMapping/DIGGEOL/moon/948/letxt.asc (5030 words)

	Lunar Certificate
		Crater Fracastorius: a large crater which demonstrates the geologic history of the region: it transects the Nectaris Basin wall, indicating that it occurred after the Nectaris Basin impact.
		It represents a 'string' of ejecta from the Nectaris Basin impact.
		Basin Schiller-Zucchius: This is one of the smaller basins on the moon, which consists of two rings.
	www.amlunsoc.org /lunar_certificate.htm (2947 words)

	SkyandTelescope.com - Moon - Rings and Things
		Mare Nectaris is the smallest of the circular maria on the Moon; lavas extend only 350 kilometers from shore to shore, and their estimated maximum thickness is just 1.5 kilometers.
		The Nectaris basin is beautifully defined by the spectacular Altai Scarp, which forms the southwestern rim of the basin.
		The northern continuation of the Altai Scarp on the western side of the basin is harder to trace, partly because of the distraction of the magnificent chain of craters: Catharina, Cyrillus, and Theophilus.
	www.skyandtelescope.com /observing/objects/moon/3304156.html?c=y&page=1 (567 words)

	Observing the Sky » Lunar Basins & their Names (Site not responding. Last check: 2007-10-10)
		Basins are the largest craters on the Moon, but they weren’t recognized because nearly all of the ones on the Earth-ward facing hemisphere are filled with mare lava flows.
		This 930 km basin just over the western limb of the Moon is a beautiful bulls-eye 3 ring basin, with rings clearly visible because only small amounts of lava have reached the surface.
		We recognized basin structure around 10 maria on the near side and discovered 14 basins on the far side of the Moon.
	www.observingthesky.org /index.php?p=85 (680 words)

	ALS Lunar Observers Certificate List of Objects
		Crater Fracastorius: a large crater which demonstrates the geologic history of the region: it transects the Nectaris Basin wall, indicating that it occurred after the Nectaris Basin impact.
		It represents a 'string' of ejecta from the Nectaris Basin impact.
		Basin Schiller-Zucchius: This is one of the smaller basins on the moon, which consists of two rings.
	www.lunar-reclamation.org /observation_list.htm (2616 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		Three proposed explanations for the origin of the grooves and mounds are extrusive volcanism, impact of ejecta from the Imbrium basin, and mass-wasting caused by a shock wave from the Imbrium basin impact.
		The northern anomalies lie, from west to east, near the projection of the northern rim of Keeler-Heaviside basin, outside the southern rim of the pre-Nectarian FreundlichÐSharonov basin, and straddling the rim crest of the Nectarian Korolev basin.
		It shows the Moscoviense and Mendeleev basins to be gravity lows of equal value, forcing some of AnandaÕs data to the west and some to the east, whereas AnandaÕs original map shows a positive anomaly centered slightly west of Moscoviense and a negative one equally offset to the west of Mendeleev.
	webgis.wr.usgs.gov /downloads/digeol/moon/1047/lftxt.doc (7276 words)

	PSRD: Uranus and Neptune: Late Bloomers
		The Imbrium basin is older than the non-mare lava flows of the Apennine Bench Formation, which samples from the Apollo 15 mission show formed 3.84 billion years ago.
		Apollo 16 landed on ejecta from the Nectaris basin.
		The huge Hellas basin is clearly visible on this topographic map of Mars, in which blue is low and red represents high elevations.
	www.psrd.hawaii.edu /Aug01/bombardment.html (3138 words)

	Irene Antonenko, Ph.D. Thesis: Chapter 4
		The ejecta deposits of Crisium basin are, therefore, expected to blanket the Smythii region and the rugged plains that occupy the area between the inner and outer rings of Smythii basin may represent this ejecta material.
		The Mendel-Rydberg basin is a Nectarian aged basin that is approximately 630 km in diameter [Wilhelms, 1987].
		This pre-Nectarian basin is approximately 620 km in diameter [Wilhelms, 1987].
	home.the-wire.com /~iant/Thesis/chapter4/chapt4.html (18788 words)

	Lunar (Site not responding. Last check: 2007-10-10)
		The Sea of Serenity is a 2 or 3 ringed basin with a diameter of 750km.
		The Serpentine ridge runs generally northward and is a classic example of a "wrinkle ridge," caused by horizontal compression due to the weight of lava flows.
		Located in the southern section of the Mare, Rosse is interesting with a plume of light colored ejecta spreading to the right of the picture in a conical shape.
	www.r390a.com /lunar.htm (225 words)

	The True Age of the crater Alphonsus
		In accordance to the principle of superposition, the location of one of these Nectaris basin secondaries on the rim of the crater Alphonsus would necessarily limit it's age to that era preceding the Nectaris impact event, the Pre-nectarian.
		The next purported Nectaris basin secondary we'll examine is Nicolai Z shown above in a large scale image with it's linear relationship to the Nectaris basin and dimensionality indicated as before.
		Any sculpture evident from the Nectaris basin impact which would have positively determined Alphonsus' age as Nectarian is in any case suppressed completely by the subsequent Imbrium event and it's ejecta-- which latter evidence at least proves beyond any doubt that Alphonsus pre-dates the Imbrium era.
	www.cityastronomy.com /alphonsus-prenectarian-article.htm (1821 words)

	BBC - h2g2 - The Lunar 100
		The bright surface is comprised mainly of Anorthosite, a light, frothy rock which floated to the surface as the molten moon differentiated and heavier material sank to form the core and mantle.
		Medium sized, 380 km diameteter, basin, that is the only one on the facing side of the moon to be completely self contained.
		It is concentric with the northern third of the Imbrium basin.
	www.bbc.co.uk /dna/h2g2/A2843796 (1014 words)

	NEEP602
		Although the selection of the Nectaris impact event as the beginning of this time unit evolved from the lunar mapping program of the 1960s and 1970s (Stuart-Alexander and Wilhelms, 1975), the usefulness of its selection is reinforced by the Nectaris Basin being the oldest of the mascon basins.
		The old large basins and crustal strengthening stage of lunar evolution therefore encompasses major crustal changes as well as the formation of all the still recognizable nonmascon large basins.
		A cataclysmic compression of all the events associated with the formation of old and young large basins as well as the crater saturation in the highlands does not appear to be supported by the analysis leading to the model of lunar evolution presented here.
	fti.neep.wisc.edu /neep602/LEC10/EVOL/evolution1.html (3632 words)

	Janssen and Vlacq
		South of the Nectaris Basin, the Moon has a sameness of flat-floored craters that makes identification of particular features difficult and it took the expertise and experience of John McConnell to correctly identify this image.
		Most rilles occur on maria lavas, but the Janssen patch of smoothness is not dark at full Moon and doesn't have the spectral properties of maria.
		The various linear valleys to the East of the rille are radial to Nectaris, so are expected ejecta from the formation of Nectaris.
	www.eaas.co.uk /gallery/moon/20041130_Jenssen.html (305 words)

	Amazon.com: "basin ejecta": Key Phrase page (Site not responding. Last check: 2007-10-10)
		deposits ejected from the basin can extend for a distance that is a mul- tiple of the crater radius.
		Basins that have been flooded with lava to...
		the large, circular impact basins The intercrater plains of Mercury are brighter and are likely composed of impact crater and basin ejecta-not lava flows.
	amazon.com /phrase/basin-ejecta (360 words)

	Dome near Piccolomini:Highland Domes
		These three low highland domes have something in common: they are all positioned within the Nectaris basin, in the surroundings of the Altai Scarp.
		The Nectaris basin was partially filled by lavas that formed the Mare Nectaris.
		In our view, a careful study of the domes inside the Nectaris basin can provide useful clues as to the nature of the highland dome volcanism.
	www.glrgroup.org /news/2.htm (1986 words)

	The Geology of Multi-Ring Impact Basins - Cambridge University Press (Site not responding. Last check: 2007-10-10)
		$90.00 (C) Multi-ring basins are large impact craters formed in the early history of planets.
		The Moon offers an exceptional chance to study these phenomena and this book provides a comprehensive geological study using data from lunar landings and remote sensing of the Moon.
		The author covers the formation and development of basins and considers their chemistry and mineralogy.
	www.cup.cam.ac.uk /us/catalogue/print.asp?isbn=0521261031&print=y (127 words)

	Hitchhiker's Guide to Rukl Chart 57
		This mountain range appears to be a fault scarp sloping toward Mare Nectaris.
		The Altai Scarp and the walls of Theophilus/Cyrilius/Catharina make a double ring of mountains around Mare Nectaris, rather like the double ring around Orientale, except that only half of it is readily visible.
		This is the best chance we earthbound observers get to see "live" something like what Orientale looks like face-on in the spacecraft pictures.
	www.shallowsky.com /moon/rukl57.html (441 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		Even larger basins are surrounded by circular mountain chains (multiringed basins, Mare Orientale).
		Alpine Valley (N) (150x10 km) is a tectonic graben formed at the Imbrium Basin impact, with later volcanic flooding and a lava channel (rille).
		Rims of large impact basins or the outcrops of the ancient terra, flooded around by younger lavas.
	emc.elte.hu /~hargitai/hold/translation-int.doc (572 words)

	Observing the Sky
		The problem is that the moon is rarely at the extreme libration and right lighting necessary to perceive the basin, so maybe that is why only Shaler recorded it.
		Even Shaler, according to your account, perceived only “the rim of a giant farside crater.” What struck me as extraordinary when I first saw it on the globe, and struck Kuiper when I took it to him, was not just the “crater” but the multiple concentric, bulls-eye-like ring structure.
		As an aside, to prove that the multi-ring basin concept had not sunk in before Orientale, I got a letter after Kuiper and I published, from Nobel laureate Harold Urey, saying that he could see no such structures in our photos and thought this paper was a poor way to start a career!
	www.observingthesky.org /index.php?m=20031024 (1544 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		Basins are big craters, caused by impact of a heavy body.
		It's approximately the same size as the Mare Crisium basin in the other mosaic.
		At the lower left of the basin you can see the secondary wall of the basin.
	huizen.ddsw.nl /bewoners/maan/images/moon/980810/980810.html (156 words)

	Planetary Geology \| The Earth's Moon \| Part II
		Radiometric ages and relative geologic dating show that the flows probably occurred several hundred million years after the formation of the impact basins, thereby indicating that they were not impact related melt caused by the craters.
		Nectarian (3.92 to 3.95 billion years ago) Named for the Nectaris Basin, a huge multiring basin on the nearside that sent ejecta almost to the opposite side of the Moon.
		Remember, most of the maria are found on the near side of the Moon, possibly due to the offset of the lunar core towards the Earth.
	wapi.isu.edu /Geo_Pgt/Mod06_Moon_a_b/Mod6Part2.htm (1620 words)

	Mass flux in the ancient Earth-Moon system and benign implications for the origin of life on Earth
		The origin of life on Earth is commonly considered to have been negatively affected by intense impacting in the Hadean, with the potential for the repeated evaporation and sterilization of any ocean.
		This is higher by more than an order of magnitude than a flux curve that declines continuously and uniformly from lunar accretion to the rate inferred for the older mare plains.
		There are ∼30 pre-Nectarian basins, and they were probably part of the same cataclysm (starting at ∼4.0 Ga?) because the crust is fairly intact, the meteoritic contamination of the pre-Nectarian crust is very low, impact melt rocks older than 3.92 Ga are virtually unknown, and ancient volcanic and plutonic rocks have survived this interval.
	www.agu.org /pubs/crossref/2002/2001JE001583.shtml (537 words)

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