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Topic: Lower Imbrian

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	[No title]
		The upper half of the map portrays the geology of the earth-facing or near side, and the lower half shows terrain that was unknown before spacecraft photography.
		Similar plains of Imbrian age that are distant from the Orientale basin may be ejecta of Imbrium-basin secondary craters or of large Imbrian primary craters.
		In the Imbrian Period, ejecta from the distant Imbrium basin formed scattered secondary craters, Orientale basin deposits blanketed a huge region on the west limb including the Mendel-Rydberg and Bailly basins, and Orientale ejecta formed many secondary craters beyond this blanket.
	astrogeology.usgs.gov /Projects/PlanetaryMapping/DIGGEOL/moon/1162/lstxt.asc (4532 words)

	Lower Imbrian - Wikipedia, the free encyclopedia
		Pre-Nectarian - Nectarian - Lower Imbrian - Upper Imbrian - Eratosthenian - Copernican
		In the Lunar geologic timescale, the Lower Imbrian epoch occurred between 3850 million years ago to about 3800 million years ago.
		The impact which created the Mare Imbrium basin occurred at the start of the epoch, and it represents the period during which the newer large basins were formed.
	en.wikipedia.org /wiki/Lower_Imbrian (149 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		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).
		Two lower values (-0.4 to -0.8 gammas) are southeast of Tsiolkovsky, in the crater Subbotin and northeast of it.
		Imbrian plains and mantles in the map area could also be of this origin in spite of their great distance from the two basins (Chao and others, 1973; Moore and others, 1974).
	webgis.wr.usgs.gov /downloads/digeol/moon/948/letxt.doc (5077 words)

	Mare Nubium (Site not responding. Last check: 2007-10-16)
		The actual basin is believed to be of Pre-Nectarian system, with the surrounding basin material being of the Lower Imbrian epoch.
		The mare material is of the Upper Imbrian epoch.
		The crater to the east of the mare is Bullialdus, which is of the Eratosthenian Epoch.
	pedia.newsfilter.co.uk /wikipedia/m/ma/mare_nubium.html (113 words)

	Mare Nectaris
		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.starrepublic.org /encyclopedia/wikipedia/m/ma/mare_nectaris.html (123 words)

	Lower Imbrian -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-16)
		In the (Click link for more info and facts about Lunar geologic timescale) Lunar geologic timescale, the Lower Imbrian epoch occurred between 3850 million years ago to about 3800 million years ago.
		The (The striking of one body against another) impact which created the (Click link for more info and facts about Mare Imbrium) Mare Imbrium basin occurred at the start of the epoch, and it represents the period during which the newer large basins were formed.
		The Lower Imbriam was preceded by the (Click link for more info and facts about Nectarian) Nectarian.
	www.absoluteastronomy.com /encyclopedia/l/lo/lower_imbrian.htm (169 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		Although topographic features are subdued to a degree that would indicate early Imbrian or pre-Imbrian age in main-sequence craters, superposition of the type example on middle or late Imbrian features of the Orientale basin floor suggests relative youth and, therefore, an original form distinct from that of the main-sequence craters.
		Includes craters of two types: (1) those difficult to assign to either the upper or lower Imbrian because of small size, resolution limitations, extensive flooding by younger materials, or proximity to large youthful craters; (2) those whose central peaks and interior profiles are unlike those of main-sequence craters.
		The most extensive of these are the light terra plains materials of Imbrian age (unit Ip) which lie predominantly in circumbasin troughs and on the floors of pre-Imbrian and lower Imbrian craters.
	webgis.wr.usgs.gov /downloads/digeol/moon/703/lnrtxt.doc (4236 words)

	Mare Orientale (Site not responding. Last check: 2007-10-16)
		However, it is the freshest impact basin on the Moon and is believed to be slightly younger than the Imbrium Basin, which formed about 3.85 billion years ago.
		The surrounding basin material is of the Lower Imbrian epoch, with the mare material being of the Upper Imbrian epoch.
		The mare is about 600 miles across and was formed by the impact of an asteroid sized object.
	www.1-free-software.com /en/wikipedia/m/ma/mare_orientale.html (282 words)

	Mare Tranquillitatis
		Mare Tranquillitatis ("sea of tranquility") is a lunar mare that sits within the Tranquillitatis basin on Earth's Moon.
		The mare material within the basin consists of basalt in the intermediate to young age group of the Upper Imbrian[?] epoch.
		The surrounding mountains are thought to be of the Lower Imbrian[?] epoch, but the actual basin is probably Pre-Nectarian[?].
	www.ebroadcast.com.au /lookup/encyclopedia/ma/Mare_Tranquillitatis.html (155 words)

	Upper Imbrian - Wikipedia, the free encyclopedia
		In the Lunar geologic timescale, the Upper Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago.
		It was preceded by the Lower Imbrian period and followed by the Eratosthenian.
		This page was last modified 22:13, 13 September 2005.
	en.wikipedia.org /wiki/Upper_Imbrian (92 words)

	Lower Imbrian - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-10-16)
		Lower Imbrian - Encyclopedia, History, Geography and Biography
		This page was last modified 15:10, 1 Apr 2005.
		The article about Lower Imbrian contains information related to Lower Imbrian.
	www.arikah.net /encyclopedia/Lower_Imbrian (162 words)

	[No title]
		At the lower right is the same area as it appeared on Lunar Aeronautical Chart (LAC) 39, which was one sheet of the earliest series of detailed cartographic maps of the Moon showing surface relief.
		The anomalies are probably caused by the dense basaltic lava flows that fill the craters and the underlying denser materials in the lower part of the crust that were thrust upward by the impact.
		Lower density material became concentrated in the upper part of the mantle, whereas denser material settled in the lower part.
	www.apolloexplorer.co.uk /books/sp-362/ch1.htm (8017 words)

	EvC Forum: Geology Glossary
		Seismic velocities are distinctly lower in the asthenosphere than in adjacent parts of the earth's interior.
		The general lowering of the surface of the land by processes of erosion.
		The combined action of all of the various processes that cause the wearing away and lowering of the land, including weathering, mass wasting, stream action, and ground-water activity.
	www.evcforum.net /WebPages/Glossary_Geology.html (7529 words)

	Irene Antonenko, Ph.D. Thesis: Chapter 4
		The lower age bound for these cryptomafic patches is obtained from the age of Hevelius crater, which contains parts of the largest cryptomafic patch and is adopted as the lower age boundary for all Procellarum cryptomafic patches.
		The age of approximately 3.8 b.y., the boundary between the upper and lower Imbrian series, is therefore adopted as the upper age bound for the cryptomafic deposits in this region.
		For the younger cryptomafic unit, inside the inner ring of Humboldtianum, the terra material is adopted as the lower age bound and the light plains are adopted as the upper age bound.
	home.the-wire.com /~iant/Thesis/chapter4/chapt4.html (18788 words)

	Upper Imbrian -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-16)
		In the (Click link for more info and facts about Lunar geologic timescale) Lunar geologic timescale, the Upper Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago.
		It was the period during which the (The layer of the earth between the crust and the core) mantle below the Lunar basins partially melted and filled them with (The commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene) basalt.
		It was preceded by the (Click link for more info and facts about Lower Imbrian) Lower Imbrian period and followed by the (Click link for more info and facts about Eratosthenian) Eratosthenian.
	www.absoluteastronomy.com /encyclopedia/U/Up/Upper_Imbrian.htm (123 words)

	Cowley Lecture 17 - Earth and Its Nearest Cosmic Neighbor, The Moon (Site not responding. Last check: 2007-10-16)
		The crater Archimedes (A) was clearly formed after the Imbrian event, AND after the subsequent flooding of the basin by basalt.
		The inner Imbrian rings are now covered by the subsequent basalt flooding of the basin, that also filled the floor of Archimedes.
		This material is believed to have been ejected in the Imbrian event, and it can be seen clearly in the region of the Fra Mauro crater.
	www.astro.lsa.umich.edu /users/cowley/lecture17 (3346 words)

	Moon
		Some rocks, collected from the lower areas of the lunar surface that are observed as maria from Earth, are similar to the basalt found on Earth.
		Sir William Lower, drawing the Moon circa 1611 in Wales, remarked that the full moon resembled "a tart which his cook had made".
		The Imbrian Period lasted until 3.1 billion years ago, and marked the appearance of the basalt maria which was forced up from its interior and spread in layers over the low depressions of the Moon's surface.
	infoman16.tripod.com /Articles/moon.htm (7581 words)

	Mare Frigoris (Site not responding. Last check: 2007-10-16)
		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.
		The mare appears as darker grey material in the lower section of the photo below.
		You can just make out the crater Aristoteles as a lighter grey circular feature to lower right-center of the photo, and south of Frigoris.
	lunar.arc.nasa.gov /science/atlas/mare/mfrigoris.htm (114 words)

	Mare Nubium (Site not responding. Last check: 2007-10-16)
		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)

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