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Topic: Lunar geologic timescale

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Lower Imbrian

Nectarian

Eratosthenian

Upper Imbrian

Copernician

Geologic time scale

Exponential timeline

Mesozoic

Cosmological timeline

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	Moon (Site not responding. Last check: 2007-10-18)
		The plane of the lunar orbit maintains an inclination of 5.145 396° with respect to the ecliptic (the orbital plane of the Earth), and the lunar axis of rotation maintains an inclination of 1.5424° with respect to the normal to that same plane.
		The lunar crust is composed of a variety of primary elements, including uranium, thorium, potassium, oxygen, silicon, magnesium, iron, titanium, calcium, aluminum and hydrogen.
		Lunar Prospector results, however, indicate the presence of hydrogen in the permanently shadowed regions, which could be in the form of water ice.
	www.muestrario.com /wiki/en/wikipedia/m/mo/moon.html (3848 words)

	Moon K-12 Experiments for Lesson Plans & Science Fair Projects
		The plane of the lunar orbit maintains an inclination of 5.145 396Â° with respect to the ecliptic (the orbital plane of the Earth around the Sun), and the lunar axis of rotation maintains an inclination of 1.5424Â° with respect to the normal to that same plane.
		The points where the Moon's orbit crosses the ecliptic are called the "lunar nodes": the North (or ascending) node is where the Moon crosses to the North of the ecliptic; the South (or descending) node where it crosses to the South.
		Lunar Prospector results, however, indicate the presence of hydrogen in the permanently shadowed regions, which could be in the form of water ice.
	www.juliantrubin.com /encyclopedia/astronomy/moon.html (5987 words)

	Moon
		The lunar crust is composed of a variety of primary elements, including uranium, thorium, potassium, oxygen, silicon, magnesium, iron, titanium, calcium, aluminum and hydrogen.
		The dark and relatively featureless lunar plains are called maria, latin for seas, since they were believed by ancient astronomers to be water-filled seas.
		The numerous lunar deities are often female such as the Greek goddesses Selene and Artemis, their Roman equivalents Luna and Diana or the Thracian Bendis.
	www.starrepublic.org /encyclopedia/wikipedia/m/mo/moon.html (3250 words)

	Qwika - similar:Geologic_time_scale
		The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 Ma (million years ago), to the beginning of the Devonian period, about 416.0 Ma (ICS 2004).
		The Cambrian is a major division of the geologic timescale that begins about 542 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
		The Eocene epoch (56-34 Ma) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era.
	www.qwika.com /rels/Geologic_time_scale (1626 words)

	Geology of the Moon Online, World Encyclopedia, India encyclopedia, Featured Articles, Cover Stories, World wide ...
		Geological studies of the Moon are based on a combination of Earth based telescope observations, measurements from orbiting spacecraft, lunar samples, and geophysical data.
		Analysis of the lunar samples seem to imply that a significant percentage of the lunar impact basins formed within a very short period of time between about 4 and 3.85 Ga. This hypothesis is referred to as the lunar cataclysm or late heavy bombardment.
		Lunar rocks are in large part made of the same common rock forming minerals as found on Earth, such as Olivine, Pyroxene, and Plagioclase Feldspar (Anorthosite).
	www.chennaivision.com /windex.php?title=Geology_of_the_Moon (5391 words)

	Geologic time scale Summary
		Geologic time is generally thought of as the period of time that begins with the initial formative processes of Earth and ends with the onset of recorded human history.
		Geologic time is vast enough to accommodate, for example, all stages in organic evolution, mass extinctions and biotic recoveries, crustal plate motions and attendant episodes of crustal deformation, and long-term climatic changes.
		Until the discovery of radioactivity in 1896 and the development of its geological applications through radiometric dating during the first half of the 20th century which allowed for more precise absolute dating of rocks, the ages of various rock strata and the age of the Earth were the subject of considerable debate.
	www.bookrags.com /Geologic_time_scale (5132 words)

	Moon - Encyclopedia, History, Geography and Biography
		The lunar crust is composed of a variety of primary elements, including uranium, thorium, potassium, oxygen, silicon, magnesium, iron, titanium, calcium, aluminium and hydrogen, as determined by spectroscopy.
		The presence of usable quantities of water on the Moon would be an important factor in rendering lunar habitation cost-effective, since transporting water (or hydrogen and oxygen) from Earth would be prohibitively expensive.
		The neutron spectrometer on Lunar Prospector confirmed the presence of excess hydrogen at the lunar poles, which some have speculated to be due to the presence of water.
	www.arikah.com /encyclopedia/Moon (5200 words)

	Palaeos Timescale: Detailed Geological Timescale
		The Geological Time-Scale is hierarchical, consisting of (from smallest to largest units) ages, epochs, periods, eras and eons.
		The Geological time-scale is usually represented as a vertical table to be read from the bottom up; the oldest eras and periods at the bottom, the youngest at the top.
		Geologic Ages of Earth History - Jeff Poling - a detailed and up to date chart showing every era, period, epoch and age of the geological time scale, together with time when began and during in millions of years.
	www.palaeos.com /Timescale/timescale.html (636 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-18)
		The lunar geologic timescale divides the history of Earth's moon into five generally recognized geologic periods: the Copernican, Eratosthenian, Imbrian (upper and lower), Nectarian, and Pre-Nectarian.
		The Copernican period is the youngest geologic period of the Moon.
		Furthermore, as the oldest geologic periods of the Moon are based exclusively on the times of individual impact events (in particular, Nectaris, Imbrium, and Orientale), these punctual events will most likley not correspond to any specific geologic event on the other terrestrial planets, such as Mercury, Venus, Earth, or Mars.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=lunar_geologic_timescale (1238 words)

	Moon
		The lunar crust is composed primarily of the elements oxygen, silicon, magnesium, iron, calcium, and aluminium.
		Topography of the Moon, referenced to the lunar geoid.
		The neutron spectrometer on Lunar Prospector indicated the presence of excess hydrogen at the lunar poles, which is likely due to the presence of water ice in the upper few meters of the regolith within permanently shadowed craters.
	www.hotspotsz.com /Article_about-Moon (5589 words)

	Vacilando.eu on Geologic Timescale Table
		The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the History of Earth.
		The table of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geological Survey.
		Geologists and paleontologists constructed the geologic table based on the relative positions of different strata and fossils, and estimated the time scales based on studying rates of various kinds of weathering, erosion, sedimentation, and lithification.
	www.vacilando.eu /?title=geologic-timescale-table (1997 words)

	CalendarHome.com - - Calendar Encyclopedia (Site not responding. Last check: 2007-10-18)
		The most recent total lunar eclipse was on 3 and 4 March 2007.
		The Moon will always be full during a lunar eclipse; that is, from the perspective of the Sun, the Moon will be directly behind the Earth.
		The longest total lunar eclipse between 1000 BC and 3000 AD had a duration of 1h47m14s, and took place on May 31, 318.
	encyclopedia.calendarhome.com /cgi-bin/encyclopedia.pl?p=Total_lunar_eclipse (1336 words)

	Geologic time scale - Wikipedia, the free encyclopedia
		The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth.
		The principles underlying geologic (geological) time scales were laid down by Nicholas Steno in the late 17th century.
		Geologists and paleontologists constructed the geologic table based on the relative positions of different strata and fossils, and estimated the time scales based on studying rates of various kinds of weathering, erosion, sedimentation, and lithification.
	en.wikipedia.org /wiki/Geologic_timescale (2059 words)

	Lunar geologic timescale - Wikipedia, the free encyclopedia
		The lunar geologic timescale (or perhaps more properly, the selenologic timescale) divides the history of Earth's Moon into six generally recognized geologic periods:
		The majority of datable lunar samples are basalts of Imbrian age.
		Geologic History of the Moon, Don Wilhelms, U.S. Geological Survey Professional Paper 1348, 1987.
	en.wikipedia.org /wiki/Lunar_geologic_timescale (225 words)

	Moon - ExampleProblems.com
		The terms lunar, selene/seleno-, and cynthion (from the Lunar deities Selene and Cynthia) refer to the Moon (aposelene, selenocentric, pericynthion, etc.).
		Because the lunar orbit is also inclined to the Earth's equator, the Moon seems to oscillate up and down (as a person's head does when nodding) as it moves in celestial latitude (declination).
		The first robot lunar rover to land on the Moon was the Soviet vessel Lunokhod 1 on November 17 1970 as part of the Lunokhod program.
	www.exampleproblems.com /wiki/index.php/Moon (5208 words)

	Moon - Thagodz Wiki
		The composition of the lunar core is not well constrained, but most believe that it is composed of metallic iron alloyed with a small amount of sulfur and nickel.
		The lunar geologic timescale is divided in time based on a few prominent basin-forming impact events, such as Nectaris, Imbrium, and Orientale.
		The neutron spectrometer on Lunar Prospector indicated the presence of excess hydrogen at the lunar poles, which is likely due to the presence of water ice in the upper few meters of the regolith within permanently shadowed craters.
	www.thagodz.com /search/wiki/?title=Moon (6870 words)

	Moon - Article about Moon (Site not responding. Last check: 2007-10-18)
		The related adjective for the Moon is lunar (again from the Latin root), but this is not found in combination, the combining forms seleno-/-selene (again from the Greek) and -cynthion (from the Lunar deity Cynthia) being used in terms relating to the Moon in various other contexts (e.g.
		The lunar crust is composed of a variety of major elements, such as oxygen, silicon, magnesium, iron, calcium, aluminium, but also contains important quantities of secondary elements, including titanium, uranium, thorium, potassium, and hydrogen.
		The neutron spectrometer on Lunar Prospector confirmed the presence of excess hydrogen at the lunar poles, which some have speculated to be due to the presence of water.
	yawiki.org /proc/Moon (4733 words)

	SingaporeMoms - Parenting Encyclopedia - Moon
		Apart from the word lunar, the terms selene/seleno and cynthion (from the Lunar deities Selene and Cynthia) refer also to the Moon (aposelene, selenocentric, pericynthion, etc.).
		The first man-made object to reach the Moon was the unmanned Soviet probe Luna 2, which crashed into it on September 14, 1959, at 21:02:24 Z. The far side of the Moon was first photographed on October 7, 1959 by the Soviet probe Luna 3.
		The first man to walk on the lunar surface was Neil Armstrong, commander of the American mission Apollo 11.
	www.singaporemoms.com /parenting/Moon (4057 words)

	CHAPTER 5: PLANETARY GEOLOGY: Manual of Remote Sensing
		Geologic histories of planetary surfaces are often documented in the form of geologic maps (compiled at various scales dependent on the available data and detail to be illustrated) which portray the three-dimensional surface units that comprise a planetary surface and indicate their relative stratigraphic positions.
		Geologic information was difficult to extract from drawings and photographs having spatial resolutions on the order of hundreds of kilometers, and observations by Schiaparelli, Lowell, Antoniadi, and others demonstrated that the interpretation of features observed on Mars was controversial and often highly subjective (Sheehan, 1988).
		Geologic study of Mars over the past decade has concentrated on the continued refinement and analysis of the Viking imaging data in preparation for the next wave of spacecraft exploration to be carried out by the Mars Global Surveyor orbiter and Mars Pathfinder lander missions in 1997-1999.
	marswatch.tn.cornell.edu /rsm.html (18132 words)

	Moon (Site not responding. Last check: 2007-10-18)
		Earth and Moon orbit about their barycentre, or common centre of mass, which lies about 4700 km from Earth's centre (about two-thirds of the way to the surface).
		The first man-made object to reach the Moon was the unmanned Soviet probe Luna 2, which crashed into it on September 14, 1959, at 21:02:24 Z. The far side of the Moon was first seen on October 7, 1959, when the Soviet probe Luna 3 had photographed it.
		[1] [1] China has expressed ambitious plans for exploring the Moon and is investigating the prospect of lunar mining, specifically looking for the isotope Helium-3 for use as an energy source on Earth.
	www.gogoglo.com /wiki/en/wikipedia/m/mo/moon.html (3848 words)

	Geologic timescale
		2) Discoveries in the past quarter century have substantially changed the view of geologic and paleontologic events immediately prior to the Cambrian.
		This is largely due to uncertainties in radiometric dating and the problem that deposits suitable for radiometric dating seldom occur exactly at the places in the geologic column where we would most like to have them.
		All dates given are for the end of the epoch in question.
	www.ebroadcast.com.au /lookup/encyclopedia/ge/Geologic_time.html (271 words)

	Planetary Geology \| The Earth's Moon \| Part II
		But there exist numerous other lunar volcanic features that are interesting to study.
		Lunar samples returned by the Apollo missions proved that the chemical composition and mineralogy of mare basalt are similar to those that characterize basalts on the Earth.
		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.
	geology.isu.edu /wapi/Geo_Pgt/Mod06_Moon_a_b/Mod6Part2.htm (1620 words)

	Lunar mare - Wikipedia, the free encyclopedia
		The Lunar maria (singular: mare, IPA: /ˈmɑːreɪ/) are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions.
		The dark regions are the lunar maria, whereas the lighter regions are the highlands.
		Based on data obtained from the Lunar Prospector mission, it appears that a large proportion of the Moon's inventory of heat producing elements (in the form of KREEP) is located within the regions of Oceanus Procellarum and the Imbrium basin, a unique geochemical province now referred to as the Procellarum KREEP Terrane.
	www.ipzap.com /ipzap.cgi/111010A/http/en.wikipedia.org/wiki/Lunar_mare (1208 words)

	Lunar geologic timescale at AllExperts
		The lunar geologic timescale (or perhaps more properly the selenologic timescale) divides the history of Earth's Moon into six generally recognized geologic periods:
		The majority of datable lunar samples are basalts of Imbrian age.
		Samples from before and after this period are less abundant, and the older samples have been affected by violent impact events that make precise radiometric age determination difficult.
	en.allexperts.com /e/l/lu/lunar_geologic_timescale.htm (207 words)

	Hotspots in category Craters - World Wind Central
		Aristoteles is a lunar impact crater that lies near the southern edge of the Mare Frigoris, and to the east of the Montes Alpes mountain range.
		This is the largest crater on the near side of the moon, and by convention it is termed a walled plain.
		The crater Copernicus is estimated to be about 800 million years old, the time marking the start of the Copernican era in the Lunar geologic timescale.
	www.worldwindcentral.com /hotspots/index.php?cat=70 (178 words)

	Learn more about Lunar geologic timescale in the online encyclopedia. (Site not responding. Last check: 2007-10-18)
		Learn more about Lunar geologic timescale in the online encyclopedia.
		The lunar geologic timescale divides the history of Earth's Moon into six generally recognized geologic periods:
		Pre-Nectarian Epoch: -4550 MY to -3920 MY The values for these dates remain in some dispute, as the divisions are based on the dates when various significant lunar geological events occurred and it is difficult to pinpoint them exactly.
	www.onlineencyclopedia.org /l/lu/lunar_geologic_timescale.html (216 words)

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