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Topic: Eratosthenian

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Copernician

Nectarian

Lower Imbrian

Upper Imbrian

Lunar geologic timescale

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Claudius Ptolemy

	Reference.com/Encyclopedia/Lunar geologic timescale
		The boundaries of this time scale are related to large impact events that have modified the lunar surface, changes in crater morphology that occur though time, and the size-frequency distribution of craters superposed on geologic units.
		The continued effects of impact cratering over long periods of time modify the morphology of lunar landforms in a quantitative way, and the state of erosion of a landform can also be used to assign a relative age.
		The base of the Eratosthenian period is defined by the time at which craters on a geologic unit of a certain size D
	www.reference.com /browse/wiki/Lunar_geologic_timescale (1262 words)

	Moon Society: Lunar Study and Observing Certificate
		Crater Theophilus: a complex crater with multiple central peaks, from the Eratosthenian Period.
		Crater Aristoteles: Excellent example of a complex crater from the Eratosthenian Period.
		Crater Moretus: Complex crater from the Eratosthenian Period.
	www.moonsociety.org /certificate/certificate.html (3150 words)

	Sea-of-Serenity.net \| v2.0 \| A Senshi Christmas (Site not responding. Last check: 2007-10-19)
		The basin material surrounding the mare is of the Lower Imbrian epoch, while the eastern mare material is of the Upper Imbrian epoch, and the western mare material is of the Eratosthenian epoch.
		Mare Vaporum - Mare Vaporum (the "sea of vapors") is a lunar mare located between the southwest rim of Mare Serenitatis and the southeast rim of Mare Imbrium.
		The lunar material surrounding the mare is from the Lower Imbrian epoch, and the mare material is from the Eratosthenian epoch.
	www.sea-of-serenity.net /planets_moon.php (2375 words)

	Mare Smythii
		The Smythii basin where the mare is located is of the Pre-Nectarian[?] epoch, while the surrounding features are of the Nectarian[?] system.
		The mare material, which make up the floor of the mare, is a high alumious basalt, and consists of Upper Imbrian[?] basalt covered by Eratosthenian[?] basalt.
		The crater Neper is located to the north of the mare.
	www.ebroadcast.com.au /lookup/encyclopedia/ma/Mare_Smythii.html (124 words)

	Learn more about Eratosthenian in the online encyclopedia. (Site not responding. Last check: 2007-10-19)
		Learn more about Eratosthenian in the online encyclopedia.
		Hint: Play with putting spaces before and after your words to see the different results you get.
		It is named after the crater Eratosthenes, whose formation marks the beginning of this period.
	www.onlineencyclopedia.org /e/er/eratosthenian.html (141 words)

	ALS Lunar Observers Certificate List of Objects
		Crater Werner: Excellent example of a complex crater from the Eratosthenian Period.
		Crater Eratosthenes: Excellent example of a complex crater from the Eratosthenian Period.
		Crater Bullialdus: An excellent example of a complex crater from the Eratosthenian Period.
	www.lunar-reclamation.org /observation_list.htm (2616 words)

	[No title]
		The postbasin, premare craters within the Imbrium basin (that is, Imbrian-age craters) are approximately equal in number to the total number of postmare craters (Eratosthenian and Copernican ages) in the same area.
		The most widespread flooding of the depressed parts of the lunar crust occurred near the end of the Imbrian Period with the filling of most of the nearside multi-ring basins by mare material.
		This was followed by a less extensive episode of mare generation, terra blanketing, and volcanic mare plateau formation (as in the Marius Hills), mostly in the Eratosthenian Period.
	astrogeology.usgs.gov /Projects/PlanetaryMapping/DIGGEOL/moon/703/lnrtxt.asc (4174 words)

	Mare Nubium (Site not responding. Last check: 2007-10-19)
		Each of these periods were themselves punctuated by discreet phases of widespread magma eruptions: three during both the Early Imbrian Epoch (~3.5-3.3 Ga) and the Early Eratosthenian Period (~3.3-3.1 Ga), and finally, two in the Late Eratosthenian Period (up to 2.2 Ga).
		The freshest lavas can be found off the eastern border of the Fra Mauro peninsula and, mantling a much larger area, most of the central western Nubium basin.
		The last massive outpouring of lava continued until the Late Eratosthenian Period and we have dated the freshest units at around 2.3 ± 0.1 Ga with titanium content of 4-5 %.
	freespace.virgin.net /roberto.bugiolacchi/nubium.htm (680 words)

	Hortensius ReportbySteve Troy
		These domes are positive landforms formed for the most part by basalt extrusion and seem to be concentrated as low profile mare features.
		They suggest fluid volcanism of mafic magmas, can be as much as 15 km across and 150 m high, and are of the Procellarum group of late Imbrian/early Eratosthenian features.
		Low center in the photo is 17 km Hortensius crater with Hortensius C to the East and Hortensius EC to the bottom of the photo.
	www.lunaranomalies.com /hortensius_reportbysteve_troy.htm (1284 words)

	Beyond The Exosphere - Our Solar System - Earth - Moon - History
		About 2/3 of the mara lava was extruded ruing this era.
		The Eratosthenian era covered about 3.2 billion years to 1.0 billion year ago.
		Volcanic activity continued during this time, and the remainder of the mare rocks were formed.
	library.thinkquest.org /28053/solarsys/earth/moon/history.htm (408 words)

	posidonius double peak and Fabricius' floor ridges (Site not responding. Last check: 2007-10-19)
		As yet another example that the waxing and waning Moon are not created equal, here is an example of a very interesting feature that is best viewed during the waxing Moon...
		The upper and left sections of this "bracket" of odd linear mountain ranges within Eratosthenian age Fabricius are thought to be unusually large slump terraces from the crater walls.
		However, the lower range, along with the actual elongated central peak, are though to have their unusual linear forms because of pre-existing deep crustal fractures, which guided their form when the impact occured.
	www.cityastronomy.com /posidonius-and-janssen-peaks.htm (265 words)

	Caithness CWS - Geography - Geology - Two ancient worlds The Moon and The Northern Highlands - Index
		These periods are named after prominent lunar landmarks or features thought to be contemporary with them.
		There are three of these and they comprise, firstly the "Imbrian" at 4,000 million years ago and named after the Mare Imbrium a lava-filled impact basin 1,00OKm in diameter, and secondly and thirdly the "Eratosthenian" at 2,000 My and the "Copernican" at 1,000My which are named after the craters Eratosthenes and Copernicus.
		It is concluded that the Earth and Mars as well as Mercury and the moons of Jupiter and Saturn, (not enough is known of the surface of Venus) were all affected in a like manner during the same or similar periods.
	www.caithness.org /geography/geology/index.htm (1119 words)

	Eratosthenian - The Wordbook Encyclopedia
		Thewordbook is a comprehensive encyclopedia and a reference search engine, in which you have found this entry about Eratosthenian.
		TheWordbook.com is your reference book and invites you to quarry.
		Translation - whether it means now or is called meant.
	www.thewordbook.com /Eratosthenian (196 words)

	Planetary Geology \| The Earth's Moon \| Part II
		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.
		Eratosthenian (3.15 to 1.0 billion years ago) Formation of Eratosthenes crater and includes craters that are slightly degraded and without visible rays (compared to Copernican deposits).
		Copernican (1.0 billion years to present) Youngest level of the Moon’s stratigraphy; includes the freshest craters, many of which were formed on top of mare deposits.
	wapi.isu.edu /Geo_Pgt/Mod06_Moon_a_b/Mod6Part2.htm (1620 words)

	Ages and stratigraphy of mare basalts in Oceanus Procellarum, Mare Nubium, Mare Cognitum, and Mare Insularum
		Volumetrically, most of the basalts erupted in the Late Imbrian Period between ∼3.3 and 3.7 b.y., and we see evidence that numerous units have been resurfaced.
		During the Eratosthenian Period, significantly less basalt was erupted.
		Depending on the absolute model ages that one can assign to the lunar chronostratigraphic systems, five units might be of Copernican age.
	www.agu.org /pubs/crossref/2003/2002JE001985.shtml (524 words)

	Adler Planetarium / CyberSpace / The Moon / Lunar Geologic Time
		Created from 3.2 billion to 1 billion years before present.
		Eratosthenian features are mostly craters with sharp features but NO rays.
		The last lunar volcanism happened during the early Eratosthenian age.
	www.adlerplanetarium.org /cyberspace/moon/time.html (568 words)

	NationMaster - Encyclopedia: Lunar eclipse
		Exploring Shorty crater during the Apollo 17 mission to the Moon.
		The lunar geologic timescale (or perhaps more properly the selenologic timescale) divides the history of Earths Moon into six generally recognized geologic periods: Copernician Period : 1100 MY to present Eratosthenian Period : 3200 MY to 1100 MY Upper Imbrian Epoch : 3800 MY to 3200 MY Lower Imbrian Epoch : 3850 MY...
		Lunar Meteorite Allan Hills 81005 A Lunar meteorite is a meteorite that is known to have originated on the Moon.
	www.nationmaster.com /encyclopedia/Lunar-eclipse (3111 words)

	ORBSEARCH.COM \| encyclopedia of knowledge
		If you are looking for the term " Eratosthenian " then please try a google search:
		If its not on this site then it might be listed in a general google search and you should be able to find the information you need by using the keyword Eratosthenian there.
		Content is provided as is from wikipedia.org without guarantee of accuracy.
	www.orbsearch.com /cantfindit.php?title=Eratosthenian (70 words)

	Geologic Map (ResearchIndex) (Site not responding. Last check: 2007-10-19)
		Spectral reflectance measurements (Soderblom, in preparation) indicate mare ranges from red to blue in color.
		Rays and Eratosthenian craters superposed, upper Imbrian and older craters embayed.
		Lunar Orbiter IV photographs suggest that darker mare may have lower density of craters than lighter mare patches (McCauley, 1973; Scott and Eggleton, 1973).
	citeseer.ist.psu.edu /635166.html (166 words)

	DNK Amazon Store :: Maps of the Ancient Sea Kings: Evidence of Advanced Civilization in the Ice Age (Site not responding. Last check: 2007-10-19)
		Maps such as the Piri Re'is and Oronteus Finaeus maps showed, via a kind reverse engineering, evidence of being drawn using earlier maps that appear to have been composed using spherical geometry, which was not invented until much later than the Greek and Roman era.
		Hapgood notes that the maps also appear to have been drawn without what is known as the Eratosthenian Error, (a two percent error in the measurement of the earth) so they would appear to be definitively not originally composed by a map maker versed in the Greco-Roman tradition.
		He also discovered that the coastline of the Antarctic was accurately drawn (this confirmed by the chief of the cartographic section of Westover Air Force Base) at a time when it was not covered with ice.
	www.entertainmentcareers.net /book/ProductDetails.aspx?asin=0932813429 (765 words)

	Abstract (Site not responding. Last check: 2007-10-19)
		The geology of the lunar surface has not been methodically mapped at a consistent scale since the Apollo era.
		The selected quadrangle includes Lower Imbrian basin-related materials, Upper Imbrian mare basalts and pyroclastic deposits, Eratosthenian mare basalts and crater materials, and Copernican impact and related deposits.
		The mapping approach is iterative, with initial map drafts focusing on characterization of map units and contact and stratigraphic relationships using topographic models and Lunar Orbiter IV regional photomosaics.
	www.psi.edu /PSIseminars/archive_spring_2006/skinner.html (185 words)

	Moon Society: Geologic Processes on the Moon
		Medium sized craters that have all these parts except the bright ray pattern are in the next in age.
		These are from the 'Eratosthenian Period,' which extends from 1.2 to 3.2 billions years of age.
		Medium sized craters that have lost their bright ray pattern and the discontinuous ejecta are much older.
	www.moonsociety.org /certificate/lunargeology.html (4843 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		I suggest the crater Flamsteed near Surveyor 1.
		Proves a pinpoint landing, get pieces of the lander for materials study, sample Eratosthenian (post-Imbrian) lava flows.
		Also with the right mobility aids get to the partially buried crater ring and sample deep bed rock excavated by the impact.
	www.orbitersim.com /Forum/default.aspx?g=posts&t=6990 (1512 words)

	Telescope Reviews:
		When I actually started viewing my eyes were instantly drawn to the quiet spectacle of Lambert, Lambert R, Pytheas and Draper on the wide expanse of Mare Imbrium.
		Just to the south of Lambert, a 30 Km Eratosthenian crater with terraced walls, lay Lambert R, a ghostly ring barely visible even in the grazing light near the terminator, it's sunken ramparts in ancient times swallowed by hot Imbrium lavas.
		Further along to the south, the 10 Km Pytheas seems to ride a wrinkle ridge that extends down to 8.8 Km Draper and Draper C.
	www.cloudynights.com /photopost/showphoto.php?photo=7056&password=&sort=2&thecat=500 (287 words)

	Donald E. Davis career overview up to now.
		Since these three images are in the Public Domain, and indeed were created at taxpayer expense, I gladly make them available as 1K pixel wide jpeg files compressed to reasonable size.
		The Present Moon (A.C.I.C. L.E.M.-1 mosaic, 548K), Eratosthenian age Moon (500K), and Late Imbrium age Moon (660K).
		At that time, a visit to the Menlo Park office from the science writer for the San Francisco Chronicle took place, with my supervisor Don Wilhelms among those interviewed.
	www.donaldedavis.com /PARTS/SHORTBIO.html (4481 words)

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