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NECTARIAN

  • Nectarian
  • Geologic period, 3920 to 3850 million years ago

    The Nectarian Period of the lunar geologic timescale was from 3.920 billion years ago to 3.850 billion years ago. It is the period during which the Nectaris

    Nectarian

    Nectarian

  • Pre-Nectarian
  • Geologic period, 4533 to 3920 million years ago

    The pre-Nectarian period of the lunar geologic timescale runs from 4.533 billion years ago (the time of the initial formation of the Moon) to 3.920 billion

    Pre-Nectarian

    Pre-Nectarian

  • Lunar geologic timescale
  • Geological dating system of the Moon

    Copernican, Eratosthenian, Imbrian (Late and Early epochs), Nectarian, and Pre-Nectarian. The boundaries of this time scale are related to large impact

    Lunar geologic timescale

    Lunar geologic timescale

    Lunar_geologic_timescale

  • Geologic time scale
  • System that relates geologic strata to time

    Earth's geologic time scale. Five geologic systems/periods (Pre-Nectarian, Nectarian, Imbrian, Eratosthenian, Copernican), with the Imbrian divided into

    Geologic time scale

    Geologic time scale

    Geologic_time_scale

  • Mare Nectaris
  • Feature on the moon

    was formed 3.8–3.9 billion years ago. This event marks the beginning of Nectarian period of the lunar geologic timescale. The best-preserved part of the

    Mare Nectaris

    Mare Nectaris

    Mare_Nectaris

  • Alphonsus (crater)
  • Crater on the Moon

    impact crater on the Moon that dates from the pre-Nectarian era. (Older sources state that it is Nectarian in age.) It is located on the lunar highlands on

    Alphonsus (crater)

    Alphonsus (crater)

    Alphonsus_(crater)

  • Imbrian
  • Lunar geologic period

    subsequent Late Imbrian epoch. The Early Imbrian was preceded by the Nectarian. In the Lunar geologic timescale, the Late Imbrian epoch occurred from

    Imbrian

    Imbrian

  • Clavius (crater)
  • Lunar surface depression

    "encompassed by a wall damaged by successive explosions". It dates to the Nectarian period of the lunar geologic timescale. This crater is located in the

    Clavius (crater)

    Clavius (crater)

    Clavius_(crater)

  • Mare Tranquillitatis
  • Lunar mare

    to be of the Lower Imbrian epoch, but the actual basin is probably Pre-Nectarian. The basin has irregular margins and lacks a defined multiple-ringed structure

    Mare Tranquillitatis

    Mare Tranquillitatis

    Mare_Tranquillitatis

  • Mare Crisium
  • Feature on the moon

    basin, just northeast of Mare Tranquillitatis. Mare Crisium is a basin of Nectarian age. It was formed by the flooding of basaltic lava that filled an ancient

    Mare Crisium

    Mare Crisium

    Mare_Crisium

  • Mutus (crater)
  • Crater on the Moon

    78 kilometers in diameter and 3.7 kilometers deep. It is from the Pre-Nectarian period, 4.55 to 3.92 billion years ago. The outer rim of Mutus is worn

    Mutus (crater)

    Mutus (crater)

    Mutus_(crater)

  • Abbe (crater)
  • Lunar impact crater

    Poincaré. On the lunar geologic timescale, this formation dates to the Pre-Nectarian period. The outer wall of Abbe is somewhat eroded, with small craters

    Abbe (crater)

    Abbe (crater)

    Abbe_(crater)

  • Eratosthenian
  • Lunar geologic period

    −3000 — – −2500 — – −2000 — – −1500 — – −1000 — – −500 — – 0 — Pre-Nectarian Nectarian Imbrian Eratosthenian Copernican Late Early       Periods on the

    Eratosthenian

    Eratosthenian

  • South Pole–Aitken basin
  • Large impact crater on the Moon

    recognized on The Moon. It is estimated that it was formed during the Pre-Nectarian epoch, with radiometric dating of lunar zircons proposed to originate

    South Pole–Aitken basin

    South Pole–Aitken basin

    South_Pole–Aitken_basin

  • Shackleton (crater)
  • Lunar impact crater

    is a well-preserved simple crater in a region of ancient, rugged pre-Nectarian terrain associated with the South Pole–Aitken basin rim. The South Pole–Aitken

    Shackleton (crater)

    Shackleton (crater)

    Shackleton_(crater)

  • Mare Anguis
  • Feature on the moon

    Crisium basin, Mare Anguis is a part of the Nectarian System, meaning that it was formed during the Nectarian time period. Like most mare, the surface of

    Mare Anguis

    Mare Anguis

    Mare_Anguis

  • Copernican period
  • Lunar geologic period

    −3000 — – −2500 — – −2000 — – −1500 — – −1000 — – −500 — – 0 — Pre-Nectarian Nectarian Imbrian Eratosthenian Copernican Late Early       Periods on the

    Copernican period

    Copernican period

    Copernican_period

  • Avicenna (crater)
  • Lunar impact crater

    Nernst, and to the southeast of Bragg. This formation dates to the Pre-Nectarian period on the lunar geologic timescale. Much of the northern half of Avicenna

    Avicenna (crater)

    Avicenna (crater)

    Avicenna_(crater)

  • Barringer (lunar crater)
  • Lunar impact crater

    of the Apollo basin, is the crater Scobee. This formation dates to the Nectarian epoch of the lunar geologic timescale. It is generally circular in form

    Barringer (lunar crater)

    Barringer (lunar crater)

    Barringer_(lunar_crater)

  • Genesis Rock
  • Rock retrieved from the Moon in 1971

    surpassing it. It is still an extremely old sample, formed during the Pre-Nectarian period of the Moon's history. Dating of pyroxenes from other lunar anorthosite

    Genesis Rock

    Genesis Rock

    Genesis_Rock

  • Janssen (lunar crater)
  • Crater on the Moon

    highland region near the southeastern lunar limb. It dates to the Pre-Nectarian period of the lunar geologic timescale. The entire structure has been

    Janssen (lunar crater)

    Janssen (lunar crater)

    Janssen_(lunar_crater)

  • Mare Imbrium
  • Vast lunar mare filling a basin on Earth's Moon

    Mons Hadley Delta, believed to be a fault block of pre-Imbrian (Nectarian or Pre-Nectarian) lunar crust, including the "Genesis Rock." This was also the

    Mare Imbrium

    Mare Imbrium

    Mare_Imbrium

  • Mare Fecunditatis
  • Feature on the moon

    Fecunditatis basin formed in the Pre-Nectarian epoch, while the basin material surrounding the mare is of the subsequent Nectarian epoch. The mare material is

    Mare Fecunditatis

    Mare Fecunditatis

    Mare_Fecunditatis

  • Baldet (lunar crater)
  • Crater on the Moon

    190 km diameter. On the lunar geologic timescale, this crater is from the Nectarian period. The rim of Baldet is low and worn, but generally retains its original

    Baldet (lunar crater)

    Baldet (lunar crater)

    Baldet_(lunar_crater)

  • Mare Ingenii
  • Feature on the moon

    of the Moon. The mare sits in the Ingenii basin, which is of the Pre-Nectarian epoch, which lies in turn in the outer part of the older and much larger

    Mare Ingenii

    Mare Ingenii

    Mare_Ingenii

  • Mare Humboldtianum
  • Lunar mare on the far side of the Moon

    occasion it can be hidden from view from Earth. The basin material is of the Nectarian epoch, with the mare material being of the Upper Imbrian epoch (3.4–3

    Mare Humboldtianum

    Mare Humboldtianum

    Mare_Humboldtianum

  • Steklov (crater)
  • Crater on the Moon

    northwest of the Mendel-Rydberg Basin, a 630 km-wide impact basin of Nectarian age. Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar

    Steklov (crater)

    Steklov (crater)

    Steklov_(crater)

  • Basin Groups
  • 9 subdivisions of the lunar Pre-Nectarian geologic period

    of the lunar Pre-Nectarian geologic period. The motivation for creating the Basin Groups subdivisions was to place 30 pre-Nectarian impact basins into

    Basin Groups

    Basin_Groups

  • Apollo (crater)
  • Crater on the Moon

    ring is roughly half the diameter of the outer wall. It dates to the Pre-Nectarian period of the lunar geologic timescale. Both the outer wall and the interior

    Apollo (crater)

    Apollo (crater)

    Apollo_(crater)

  • Simpelius (crater)
  • Lunar surface depression

    Moretus. On the lunar geologic timescale, this formation dates to the Pre-Nectarian period. The most distinctive aspect of this crater is the asymmetry of

    Simpelius (crater)

    Simpelius (crater)

    Simpelius_(crater)

  • Mare Smythii
  • Feature on the moon

    where the mare is located is of the Pre-Nectarian epoch, while the surrounding features are of the Nectarian system. It is contained within a minimal

    Mare Smythii

    Mare Smythii

    Mare_Smythii

  • Boussingault (crater)
  • Lunar surface depression

    Neumayer. On the lunar geologic timescale, this formation dates to the Pre-Nectarian period. The most notable aspect of this crater is the large crater that

    Boussingault (crater)

    Boussingault (crater)

    Boussingault_(crater)

  • Dirichlet–Jackson Basin
  • Feature on the moon

    The Dirichlet–Jackson Basin is a pre-Nectarian impact basin on the far side of the Moon. It is named after the craters Dirichlet (on the southeast margin)

    Dirichlet–Jackson Basin

    Dirichlet–Jackson Basin

    Dirichlet–Jackson_Basin

  • Hertzsprung (crater)
  • Crater on the Moon

    western rim, and Lucretius to the southeast. This crater dates to the Nectarian period of the lunar geologic timescale. The outer rim of Hertzsprung has

    Hertzsprung (crater)

    Hertzsprung (crater)

    Hertzsprung_(crater)

  • Mendeleev (crater)
  • Impact crater

    discontinuous ring of peaks with no central peak. Mendeleev dates to the Nectarian period of the lunar geologic timescale. The interior plains of Mendeleev

    Mendeleev (crater)

    Mendeleev (crater)

    Mendeleev_(crater)

  • Bell (crater)
  • Lunar impact crater

    geologic timescale, Bell is catalogued as from the Nectarian period, but may instead be Pre-Nectarian or Early Imbrian. The outer wall of Bell has been

    Bell (crater)

    Bell (crater)

    Bell_(crater)

  • Rheita (crater)
  • Crater on the Moon

    crater floor is flat and it has a central peak. Rheita is a crater of Nectarian age. By convention these features are identified on lunar maps by placing

    Rheita (crater)

    Rheita (crater)

    Rheita_(crater)

  • Billy (crater)
  • Crater on the Moon

    gray ejecta collars. This formation dates to 3.88 ga, placing it in the Nectarian or Early Imbrian epoch of the lunar geologic timescale, with the resurfacing

    Billy (crater)

    Billy (crater)

    Billy_(crater)

  • Geology of the Moon
  • Structure and composition of the Moon

    from the Imbrium basin. The bottom of the lunar stratigraphy is the pre-Nectarian unit, which consists of old crater plains. The lunar landscape is characterized

    Geology of the Moon

    Geology of the Moon

    Geology_of_the_Moon

  • Fleming (crater)
  • Lunar impact crater

    crater was known as Crater 203. Fleming is one of the largest craters of Nectarian age. By convention these features are identified on lunar maps by placing

    Fleming (crater)

    Fleming (crater)

    Fleming_(crater)

  • Origin of the Moon
  • Theories explaining the formation of Earth's Moon

    The origin of the Moon is usually explained by a Mars-sized body, known as Theia, striking Earth, creating a debris ring that eventually collected into

    Origin of the Moon

    Origin of the Moon

    Origin_of_the_Moon

  • Mare Australe
  • Feature on the moon

    lines the bottom of the mare. The Australe basin was formed in the Pre-Nectarian epoch, while the mare material inside formed in the Upper Imbrian epoch

    Mare Australe

    Mare Australe

    Mare_Australe

  • Zach (crater)
  • Lunar surface depression

    (44 mi) in diameter and 3.7 kilometres (2.3 mi) deep. It is from the Nectarian period, 3.92 to 3.85 billion years ago. The inner walls of the crater

    Zach (crater)

    Zach (crater)

    Zach_(crater)

  • Appleton (crater)
  • Lunar impact crater

    to the southwest is the Mare Moscoviense. This formation dates to the Nectarian epoch of the lunar geologic timescale. The crater wall and interior have

    Appleton (crater)

    Appleton (crater)

    Appleton_(crater)

  • Aliacensis (crater)
  • Crater on the Moon

    somewhat broken rings, Kaiser and Nonius. This crater dates from the Nectarian period, which lasted from 3.92 to 3.85 billion years ago. Ejecta from

    Aliacensis (crater)

    Aliacensis (crater)

    Aliacensis_(crater)

  • Schickard (crater)
  • Lunar impact crater

    Wargentin, a lava-flooded plateau. This impact event dates to the Pre-Nectarian period of the lunar geologic timescale. Schickard has a worn rim that

    Schickard (crater)

    Schickard (crater)

    Schickard_(crater)

  • Schiller (crater)
  • Lunar surface depression

    half. To the southwest of Schiller is the Schiller-Zucchius Basin, a Pre-Nectarian basin (peak ring basin). This basin has received the unofficial designation

    Schiller (crater)

    Schiller (crater)

    Schiller_(crater)

  • Pingré (crater)
  • Lunar surface depression

    southeast of the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age. By convention these features are identified on lunar maps by placing

    Pingré (crater)

    Pingré (crater)

    Pingré_(crater)

  • Late Heavy Bombardment
  • Hypothesized astronomical event

    The Late Heavy Bombardment (LHB), or lunar cataclysm, is a hypothesized astronomical event thought to have occurred approximately 4.1 to 3.8 billion years

    Late Heavy Bombardment

    Late Heavy Bombardment

    Late_Heavy_Bombardment

  • Avogadro (crater)
  • Crater on the Moon

    On the lunar geologic timescale, this formation is dated to the Pre-Nectarian period. The formation has been heavily worn and eroded by subsequent impacts

    Avogadro (crater)

    Avogadro (crater)

    Avogadro_(crater)

  • Timeline of Earth
  • years, until they coalesced to become the Moon. The Moon geology pre-Nectarian period starts. Earth was covered by a magmatic ocean 200 kilometres (120 mi)

    Timeline of Earth

    Timeline_of_Earth

  • Vlacq (crater)
  • Crater on the Moon

    Rosenberger. On the lunar geologic timescale, this crater dates to the Pre-Nectarian epoch. This crater has become eroded, but not to the degree of the larger

    Vlacq (crater)

    Vlacq (crater)

    Vlacq_(crater)

  • Richardson (lunar crater)
  • Crater on the Moon

    Artamonov. On the lunar geologic timescale, Richardson dates from the Pre-Nectarian period. A substantial portion of the crater is overlain by Maxwell, which

    Richardson (lunar crater)

    Richardson (lunar crater)

    Richardson_(lunar_crater)

  • Schwarzschild (crater)
  • Crater on the Moon

    astronomer Karl Schwarzschild (1873–1916). This formation dates to the Nectarian period of the lunar geologic timescale. The somewhat irregular outer rim

    Schwarzschild (crater)

    Schwarzschild (crater)

    Schwarzschild_(crater)

  • Mare Nubium
  • Lunar surface depression

    basin containing Mare Nubium is believed to have been part of the Pre-Nectarian system. The mare material is of the Imbrian and Eratosthenian age. Bullialdus

    Mare Nubium

    Mare Nubium

    Mare_Nubium

  • Metius (crater)
  • Crater on the Moon

    Vallis Rheita. On the lunar geologic timescale, Metius is a crater of Nectarian age. The rim of Metius does not protrude prominently into the surroundings

    Metius (crater)

    Metius (crater)

    Metius_(crater)

  • Lacus Solitudinis
  • Feature on the moon

    Imbrian epoch of the lunar geologic timescale, while the surroundings are Nectarian. To the northwest of the northern end is the small crater Bowditch, a

    Lacus Solitudinis

    Lacus Solitudinis

    Lacus_Solitudinis

  • Birkhoff (crater)
  • Crater on the Moon

    This formation is one of the oldest lunar basins, dating to the Pre-Nectarian epoch of the lunar geologic timescale. What remains of the perimeter is

    Birkhoff (crater)

    Birkhoff (crater)

    Birkhoff_(crater)

  • Mare Moscoviense
  • Lunar mare on the far side of the Moon

    surface more often and more easily there. The basin material is of the Nectarian epoch, while the mare material is of the Upper Imbrian epoch. Following

    Mare Moscoviense

    Mare Moscoviense

    Mare_Moscoviense

  • Bragg (crater)
  • Crater on the Moon

    side of the Moon, just beyond the northwest limb. It dates to the Pre-Nectarian period of the lunar geologic timescale. This formation has been heavily

    Bragg (crater)

    Bragg (crater)

    Bragg_(crater)

  • Bohr (crater)
  • Lunar surface depression

    southeast of the degraded crater Einstein. This formation is dated to the Nectarian period of the lunar geologic timescale. The rim of Bohr is worn and eroded

    Bohr (crater)

    Bohr (crater)

    Bohr_(crater)

  • Korolev (lunar crater)
  • Lunar impact crater

    discontinuous ring of peaks with no central peak. It formed during the Nectarian period of the lunar geologic timescale. This basin lies on the far side

    Korolev (lunar crater)

    Korolev (lunar crater)

    Korolev_(lunar_crater)

  • D'Alembert (crater)
  • Lunar impact crater

    or a discontinuous ring of peaks with no central peak. It dates to the Nectarian period of the lunar geologic timescale. Astride the southwest rim of d'Alembert

    D'Alembert (crater)

    D'Alembert (crater)

    D'Alembert_(crater)

  • Oppenheimer (crater)
  • Lunar impact crater

    feature about 20% larger than Oppenheimer. This formation dates to the Nectarian period of the lunar geologic timescale. The outer rim of Oppenheimer is

    Oppenheimer (crater)

    Oppenheimer (crater)

    Oppenheimer_(crater)

  • Inghirami (crater)
  • Lunar impact crater

    Inghirami is a crater of Nectarian age. Inghirami lies to the east of the Mendel-Rydberg Basin, a 630 km wide impact basin also of Nectarian age. The crater was

    Inghirami (crater)

    Inghirami (crater)

    Inghirami_(crater)

  • Big Muley
  • Largest lunar rock collected during the Apollo program

    Lunar Sample 61016, better known as "Big Muley", is a lunar sample discovered and collected on the Apollo 16 mission in 1972 in the Descartes Highlands

    Big Muley

    Big Muley

    Big_Muley

  • Epigenes (crater)
  • Crater on the Moon

    the southwest. On the lunar geologic timescale, Epigenes is a crater of Nectarian age. This formation is a picture in contrasts. The north and northwest

    Epigenes (crater)

    Epigenes (crater)

    Epigenes_(crater)

  • Pilâtre (crater)
  • Lunar surface depression

    the south of the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age. Wikimedia Commons has media related to Pilâtre (crater). "Pilâtre

    Pilâtre (crater)

    Pilâtre (crater)

    Pilâtre_(crater)

  • Albategnius (crater)
  • Crater on the Moon

    slightly to the southeast. Albategnius is one of the largest craters of Nectarian age. The level interior of Albategnius forms a walled plain, surrounded

    Albategnius (crater)

    Albategnius (crater)

    Albategnius_(crater)

  • Arrhenius (lunar crater)
  • Moon surface depression

    crater lies within the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age. To the south-southeast of Arrhenius is the worn crater Blanchard

    Arrhenius (lunar crater)

    Arrhenius (lunar crater)

    Arrhenius_(lunar_crater)

  • Landau (crater)
  • Crater on the Moon

    Coulomb-Sarton Basin, a 530 km wide impact crater of Pre-Nectarian age. This formation dates to the Pre-Nectarian period of the lunar geologic timescale. The outer

    Landau (crater)

    Landau (crater)

    Landau_(crater)

  • Barrow (crater)
  • Lunar impact crater

    Bond. On the lunar geologic timescale, this crater dates to the Pre-Nectarian epoch. This crater has been described as having a "notably square outline"

    Barrow (crater)

    Barrow (crater)

    Barrow_(crater)

  • Belʹkovich (crater)
  • Lunar impact crater

    impact crater of the form termed a walled plain. This crater dates to the Nectarian period of the lunar geologic timescale. The formation has been heavily

    Belʹkovich (crater)

    Belʹkovich (crater)

    Belʹkovich_(crater)

  • Leibnitz (crater)
  • Lunar impact crater

    to the west is the large Oppenheimer. This formation dates to the Pre-Nectarian period of the lunar geologic timescale. The outer rim of Leibnitz is roughly

    Leibnitz (crater)

    Leibnitz (crater)

    Leibnitz_(crater)

  • Al-Khwarizmi (crater)
  • Lunar impact crater

    the crater Moiseev, and northeast of Saenger. This crater dates to the Nectarian age on the lunar geologic timescale. The western inner wall of Al-Khwarizmi

    Al-Khwarizmi (crater)

    Al-Khwarizmi (crater)

    Al-Khwarizmi_(crater)

  • Van de Graaff (crater)
  • Crater on the Moon

    On the lunar geologic timescale, it is one of the largest craters of Nectarian age. The outer rim has some terracing along the southwest wall, but is

    Van de Graaff (crater)

    Van de Graaff (crater)

    Van_de_Graaff_(crater)

  • Bellinsgauzen (crater)
  • Lunar impact crater

    Bhabha. On the lunar geologic timescale, Bellinsgauzenis dated to the Nectarian period. The outer rim of Bellinsgauzen is worn but the general shape is

    Bellinsgauzen (crater)

    Bellinsgauzen (crater)

    Bellinsgauzen_(crater)

  • Campbell (lunar crater)
  • Crater on the Moon

    southeast rim, and Pawsey to the west. This formation dates to the Pre-Nectarian period of the lunar geologic timescale. It has been heavily worn and eroded

    Campbell (lunar crater)

    Campbell (lunar crater)

    Campbell_(lunar_crater)

  • Cyrillus (crater)
  • Crater on the Moon

    a 5th-century Patriarch and theologian. This formation dates to the Nectarian epoch of the lunar geologic timescale. The floor of Cyrillus contains

    Cyrillus (crater)

    Cyrillus (crater)

    Cyrillus_(crater)

  • Hess (crater)
  • Crater on the Moon

    of the Moon. On the lunar geologic timescale, Hess dates from the Pre-Nectarian period. The crater rim has been worn by subsequent impacts, leaving a

    Hess (crater)

    Hess (crater)

    Hess_(crater)

  • Weber (crater)
  • Crater on the Moon

    lies within the Coulomb-Sarton Basin, a 530 km wide impact crater of Pre-Nectarian age. Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar

    Weber (crater)

    Weber (crater)

    Weber_(crater)

  • Hermite (crater)
  • Lunar impact crater

    This crater was formed roughly 3.91 billion years ago, dating it to Nectarian period of the lunar geologic timescale. Hermite is a worn, eroded crater

    Hermite (crater)

    Hermite (crater)

    Hermite_(crater)

  • Baade (crater)
  • Lunar crater

    It lies within the Mendel-Rydberg Basin, a 630 km wide impact basin of Nectarian age. The area to the east of the Baade crater forms the junction between

    Baade (crater)

    Baade (crater)

    Baade_(crater)

  • List of craters on Mercury
  • p. C153–C162. Stuart-Alexander, D. E., and Wilhelms, D. E., 1975, The Nectarian System, a new lunar time-stratigraphic unit: U.S. Geological Survey Journal

    List of craters on Mercury

    List of craters on Mercury

    List_of_craters_on_Mercury

  • Galois (crater)
  • Crater on the Moon

    named after French mathematician Évariste Galois. It dates to the Pre-Nectarian period of the lunar geologic timescale. Features of this class are commonly

    Galois (crater)

    Galois (crater)

    Galois_(crater)

  • Wiener (crater)
  • Crater on the Moon

    overlain by the outer rampart of Wiener. This formation dates to the Nectarian epoch of the lunar geologic timescale. The northwestern half of the crater

    Wiener (crater)

    Wiener (crater)

    Wiener_(crater)

  • Barbier (crater)
  • Lunar impact crater

    Ingenii. On the lunar geologic timescale, this crater dates to the Pre-Nectarian epoch. The outer rim of Barbier has been eroded somewhat by subsequent

    Barbier (crater)

    Barbier (crater)

    Barbier_(crater)

  • Cyrano (crater)
  • Lunar impact crater

    Barbier. On the lunar geologic timescale, this crater dates to the Pre-Nectarian epoch. The most notable aspect of this crater are the small impacts along

    Cyrano (crater)

    Cyrano (crater)

    Cyrano_(crater)

  • Noachian
  • Geological system and early time period of Mars

    Noachian period is uncertain but probably corresponds to the lunar Pre-Nectarian to Early Imbrian periods of 4100 to 3700 million years ago, during the

    Noachian

    Noachian

    Noachian

  • Volcanism on the Moon
  • Volcanic processes and landforms on the Moon

    Volcanism on the Moon is represented by the presence of volcanoes, pyroclastic deposits and vast lava plains on the lunar surface. The volcanoes are typically

    Volcanism on the Moon

    Volcanism on the Moon

    Volcanism_on_the_Moon

  • Nansen (lunar crater)
  • Crater on the Moon

    following the surface up towards the limb. This formation dates to the Nectarian epoch of the lunar geologic timescale. It has been heavily worn and eroded

    Nansen (lunar crater)

    Nansen (lunar crater)

    Nansen_(lunar_crater)

  • Rabbi Levi (crater)
  • Lunar impact crater

    Zagut. On the lunar geologic timescale, this crater dates to the Pre-Nectarian epoch. It is a heavily worn and eroded crater formation, with several

    Rabbi Levi (crater)

    Rabbi Levi (crater)

    Rabbi_Levi_(crater)

  • Adams (lunar crater)
  • Lunar impact crater

    these rilles follows a course to the southeast. Adams is a crater of Nectarian age. The rim of Adams is generally circular in form, but somewhat worn

    Adams (lunar crater)

    Adams (lunar crater)

    Adams_(lunar_crater)

  • Sechenov (crater)
  • Lunar crater

    craterlet along the eastern base of the inner wall. Sechenov is a crater of Nectarian age. By convention these features are identified on lunar maps by placing

    Sechenov (crater)

    Sechenov (crater)

    Sechenov_(crater)

  • Mare Serenitatis
  • Lunar mare

    Serenitatis is located within the Serenitatis basin, which is of the Nectarian epoch. The material surrounding the mare is of the Lower Imbrian epoch

    Mare Serenitatis

    Mare Serenitatis

    Mare_Serenitatis

  • Gauss (crater)
  • Crater on the Moon

    the lunar geologic timescale, Gauss is one of the largest craters of Nectarian age. The rim of Gauss is better formed in the northern half, and the inner

    Gauss (crater)

    Gauss (crater)

    Gauss_(crater)

  • Cleomedes (crater)
  • Crater on the Moon

    lunar geologic timescale, Cleomedes is one of the largest craters of Nectarian age. The outer wall of Cleomedes is heavily worn and eroded, especially

    Cleomedes (crater)

    Cleomedes (crater)

    Cleomedes_(crater)

  • Pontécoulant (crater)
  • Lunar impact crater

    craters scattered across the inner surface. Pontécoulant is a crater of Nectarian age. The eponym of this crater is Philippe Gustave Doulcet, le Comte de

    Pontécoulant (crater)

    Pontécoulant (crater)

    Pontécoulant_(crater)

  • Lorentz (crater)
  • Lunar impact crater on the northwest limb of the Moon

    discontinuous ring of peaks with no central peak. It dates to the Pre-Nectarian period of the lunar geologic timescale. This formation is nearly as large

    Lorentz (crater)

    Lorentz (crater)

    Lorentz_(crater)

  • Maraldi (lunar crater)
  • Crater on the Moon

    Maraldi rise. On the lunar geologic timescale, Maraldi is a crater of Nectarian age. Maraldi has a very worn outer wall that is deeply incised and has

    Maraldi (lunar crater)

    Maraldi (lunar crater)

    Maraldi_(lunar_crater)

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