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Mare Tyrrhenum quadrangle

Coordinates: 15°00′S 247°30′W / 15°S 247.5°W / -15; -247.5
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Mare Tyrrhenum quadrangle
Map of Mare Tyrrhenum quadrangle from Mars Orbiter Laser Altimeter (MOLA) data. The highest elevations are red and the lowest are blue.
Coordinates15°00′S 247°30′W / 15°S 247.5°W / -15; -247.5
Image of Mare Tyrrhenum quadrangle (MC-22). Most of the region contains heavily cratered highlands. The central part contains Tyrrhena Patera and the associated ridged plains of Hesperia Planum.

The Mare Tyrrhenum quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. This quadrangle is also referred to as MC-22 (Mars Chart-22).[1] It contains parts of the regions Tyrrhena Terra, Hesperia Planum, and Terra Cimmeria.

The Mare Tyrrhenum quadrangle covers the area from 225° to 270° west longitude and 0° to 30° south latitude on Mars. Schiaparelli named the area after Earth's Tyrrhenian Sea, which lies between Italy and Sicily. The region was subsequently renamed to Mare Tyrrhena after spacecraft photos revealed that it is an old, cratered plain rather than a sea. It contains the large volcano Tyrrhenus Mons, one of the oldest, and perhaps the most complex volcanoes on Mars.[2][3] Mare Tyrrhenum's largest crater is Herschel. Licus Vallis and the Ausonia Montes are other major features in the region.

Fossa on Mars

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Large troughs (long narrow depressions) are called fossae in the geographical language used for Mars. Troughs form when the crust is stretched until it breaks. The stretching can be due to the large weight of a nearby volcano. Fossae/pit craters are common near volcanoes in the Tharsis and Elysium system of volcanoes.[4] A trough often has two breaks with a middle section moving down, leaving steep cliffs along the sides; such a trough is called a graben.[5] Lake George, in northern New York State, is a lake that sits in a graben. Studies have found that on Mars a fault may be as deep as 5 km, that is the break in the rock goes down to 5 km. Moreover, the crack or fault sometimes widens or dilates. This widening causes a void to form with a relatively high volume. When material slides into the void, a pit crater or a pit crater chain forms. Pit craters do not have rims or ejecta around them, like impact craters do. On Mars, individual pit craters can join to form chains or even to form troughs that are sometimes scalloped.[6] Other ideas have been suggested for the formation of fossae and pit craters. There is evidence that they are associated with dikes of magma. Magma might move along, under the surface, breaking the rock and more importantly melting ice. The resulting action would cause a crack to form at the surface. Pit craters are not common on Earth. Sinkholes, where the ground falls into a hole (sometimes in the middle of a town) resemble pit craters on Mars. However, on the Earth these holes are caused by limestone being dissolved thereby causing a void.[6][7][8] Tyrrhenus Mons has some beautiful fossae and pit craters associated with it. These features are easily visible in the gallery image below, obtained by HiRISE.

Knowledge of the locations and formation mechanisms of pit craters and fossae is important for the future colonization of Mars because they may be reservoirs of water.[9]

Craters

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Importance of craters

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The density of impact craters is used to determine the surface ages of Mars and other solar system bodies.[10] The older the surface, the more craters present. Crater shapes can reveal the presence of ground ice.

The area around craters may be rich in minerals. On Mars, heat from the impact melts ice in the ground. Water from the melting ice dissolves minerals, and then deposits them in cracks or faults that were produced with the impact. This process, called hydrothermal alteration, is a major way in which ore deposits are produced. The area around Martian craters may be rich in useful ores for the future colonization of Mars.[11]

  • Depression on crater floor, as seen by HiRISE under HiWish program. This scene is enlarged in the next two images.
    Depression on crater floor, as seen by HiRISE under HiWish program. This scene is enlarged in the next two images.
  • Close-up of depression on crater floor, as seen by HiRISE under HiWish program
    Close-up of depression on crater floor, as seen by HiRISE under HiWish program
  • Close-up of west edge of crater depression, as seen by HiRISE under HiWish program
    Close-up of west edge of crater depression, as seen by HiRISE under HiWish program
  • Dunes in crater, as seen by HiRISE under HiWish program. Some of these dunes are barchans.
    Dunes in crater, as seen by HiRISE under HiWish program. Some of these dunes are barchans.
  • Dunes among craters, as seen by HiRISE under HiWish program. Some of these dunes are barchans. Research published in Icarus stated that the dunes in Hershel Crater moved 0.8 m in a time span of 3.7 Earth-years. Also, it was determined that dune ripple moved 1.1 m in that time period. Other dunes may exhibit a similar amount of movement.[12]
    Dunes among craters, as seen by HiRISE under HiWish program. Some of these dunes are barchans. Research published in Icarus stated that the dunes in Hershel Crater moved 0.8 m in a time span of 3.7 Earth-years. Also, it was determined that dune ripple moved 1.1 m in that time period. Other dunes may exhibit a similar amount of movement.[12]

Hydrothermal features in Auki

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The crater Auki shows ridge networks that are believed to be evidence of hydrothermal processes that occurred after impact. Impacts fracture rock and create enormous amounts of heat. On Mars, this heat can cause ice to melt and then the resulting water to move through cracks that are generated during impact. This water will eventually deposit minerals. The mineral deposits may become evident when surrounding ground erodes. Deposits formed in this manner are more resistant to erosion.

Researchers have speculated that these hydrothermal effects should be common on Mars.[13] Ridges found in and around the center of Auki are evidence. This crater contains ridges that may have been produced after fractures formed with an impact. Using instruments on the Mars Reconnaissance Orbiter they found the minerals smectite, silica, zeolite, serpentine, carbonate, and chlorite that are common in impact-induced hydrothermal systems on Earth.[14][15][16][17][18][19] Other evidence of post-impact hydrothermal systems on Mars from other scientists who studied other Martian craters.[20][21][22]

  • Topographical map showing location of Auki crater and other nearby features. Color shows elevation.
    Topographical map showing location of Auki crater and other nearby features. Color shows elevation.
  • Wide view of Auki, as seen by CTX
    Wide view of Auki, as seen by CTX
  • Close view of central portion of Auki, as seen by HiRISE. Arrow indicates ridges. Sand dunes are present near the top of the image.
    Close view of central portion of Auki, as seen by HiRISE. Arrow indicates ridges. Sand dunes are present near the top of the image.
  • Close view of ridges from previous HiRISE image. Arrow indicates an X-shaped ridge.
    Close view of ridges from previous HiRISE image. Arrow indicates an X-shaped ridge.
  • Close view of central section of Auki showing ridges with arrow. Image is an enlargement of a previous HiRISE image.
    Close view of central section of Auki showing ridges with arrow. Image is an enlargement of a previous HiRISE image.

Channels

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There is enormous evidence that water once flowed in river valleys and channels on Mars. Images of curved channels have been seen in images from Mars spacecraft dating back to the early 1970s with the Mariner 9 orbiter.[23][24][25][26] Vallis (plural valles) is the Latin word for valley. It is used in planetary geology for the naming of landform features on other planets, including what could be old river valleys that were discovered on Mars, when probes were first sent to Mars. The Viking Orbiters caused a revolution in our ideas about water on Mars; huge river valleys were found in many areas. Space craft cameras showed that floods of water broke through dams, carved deep valleys, eroded grooves into bedrock, and traveled thousands of kilometers.[27][28][29] Some valles on Mars (Mangala Vallis, Athabasca Vallis, Granicus Vallis, and Tinjar Valles) clearly begin at graben. On the other hand, some of the large outflow channels begin in rubble-filled low areas called chaos or chaotic terrain. It has been suggested that massive amounts of water were trapped under pressure beneath a thick cryosphere (layer of frozen ground), then the water was suddenly released, perhaps when the cryosphere was broken by a fault.[30][citation needed][31]

  • Small meandering channel in the stream bed of a larger channel. Water probably eroded the two channels at different times. Image from HiRISE under the HiWish program.
    Small meandering channel in the stream bed of a larger channel. Water probably eroded the two channels at different times. Image from HiRISE under the HiWish program.
  • Channel in Ausonia Mensa, as seen by HiRISE under the HiWish program
    Channel in Ausonia Mensa, as seen by HiRISE under the HiWish program
  • Licus Vallis, as seen by HiRISE
    Licus Vallis, as seen by HiRISE
  • Channel, as seen by HiRISE under the HiWish program
    Channel, as seen by HiRISE under the HiWish program

Linear ridge networks

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Linear ridge networks are found in various places on Mars in and around craters.[32] Ridges often appear as mostly straight segments that intersect in a lattice-like manner. They are hundreds of meters long, tens of meters high, and several meters wide. It is thought that impacts created fractures in the surface, these fractures later acted as channels for fluids. Fluids cemented the structures. With the passage of time, surrounding material was eroded away, thereby leaving hard ridges behind. Since the ridges occur in locations with clay, these formations could serve as a marker for clay which requires water for its formation.[33][34][35] Water here could have supported past life in these locations. Clay may also preserve fossils or other traces of past life.

  • Linear ridge network, as seen by HiRISE under HiWish program
    Linear ridge network, as seen by HiRISE under HiWish program
  • Wide view of several groups of linear ridges, as seen by HiRISE under HiWish program
    Wide view of several groups of linear ridges, as seen by HiRISE under HiWish program
  • Close view of curved ridges, as seen by HiRISE under HiWish program. Note: this is an enlargement of previous image.
    Close view of curved ridges, as seen by HiRISE under HiWish program. Note: this is an enlargement of previous image.
  • Close view of ridges, from a previous image, as seen by HiRISE under HiWish program
    Close view of ridges, from a previous image, as seen by HiRISE under HiWish program
  • Close view of ridges, from a previous image, as seen by HiRISE under HiWish program. Arrows indicate fractures in ridge
    Close view of ridges, from a previous image, as seen by HiRISE under HiWish program. Arrows indicate fractures in ridge
  • Blocks probably formed after fracturing in ridges, as seen by HiRISE under HiWish program
    Blocks probably formed after fracturing in ridges, as seen by HiRISE under HiWish program
  • Wide view of ridge networks, as seen by HiRISE under HiWish program. Parts of this are enlarged in next three images.
    Wide view of ridge networks, as seen by HiRISE under HiWish program. Parts of this are enlarged in next three images.
  • Close view of ridge networks, as seen by HiRISE under HiWish program
    Close view of ridge networks, as seen by HiRISE under HiWish program
  • Close view of ridge networks, as seen by HiRISE under HiWish program
    Close view of ridge networks, as seen by HiRISE under HiWish program
  • Close view of ridge networks, as seen by HiRISE under HiWish program Since some ridges are at the bottom of the depression, the ridges may be from a lower layer.
    Close view of ridge networks, as seen by HiRISE under HiWish program Since some ridges are at the bottom of the depression, the ridges may be from a lower layer.

Dunes

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Sand dunes have been found in many places on Mars. The presence of dunes shows that the planet has an atmosphere with wind, for dunes require wind to pile up the sand. Most dunes on Mars are black because of the weathering of the volcanic rock basalt.[36][37] Black sand can be found on Earth on Hawaii and on some tropical South Pacific islands.[38] Sand is common on Mars due to the old age of the surface that has allowed rocks to erode into sand. Dunes on Mars have been observed to move many meters.[39][40] Some dunes move along. In this process, sand moves up the windward side and then falls down the leeward side of the dune, thus caused the dune to go toward the leeward side (or slip face).[41] When images are enlarged, some dunes on Mars display ripples on their surfaces.[42] These are caused by sand grains rolling and bouncing up the windward surface of a dune. The bouncing grains tend to land on the windward side of each ripple. The grains do not bounce very high so it does not take much to stop them.

  • Dunes, as seen by HiRISE under HiWish program
    Dunes, as seen by HiRISE under HiWish program
  • Close view of dunes, as seen by HiRISE under HiWish program
    Close view of dunes, as seen by HiRISE under HiWish program
  • Close, color view of dunes as seen by HiRISE under HiWish program. Ripples are visible on dune surface.
    Close, color view of dunes as seen by HiRISE under HiWish program. Ripples are visible on dune surface.
  • Dunes, as seen by HiRISE under HiWish program
    Dunes, as seen by HiRISE under HiWish program
  • Close view of dunes, as seen by HiRISE under HiWish program
    Close view of dunes, as seen by HiRISE under HiWish program
  • Wide view of dunes among small craters, as seen by HiRISE under HiWish program
    Wide view of dunes among small craters, as seen by HiRISE under HiWish program
  • Close view of a dune, as seen by HiRISE under HiWish program
    Close view of a dune, as seen by HiRISE under HiWish program

Layers

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Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers.[43]

  • Wide view of layered features, as seen by HiRISE under HiWish program
    Wide view of layered features, as seen by HiRISE under HiWish program
  • Layered features, as seen by HiRISE under HiWish program
    Layered features, as seen by HiRISE under HiWish program
  • Layered features, as seen by HiRISE under HiWish program. Arrows show where some layers are.
    Layered features, as seen by HiRISE under HiWish program. Arrows show where some layers are.
  • Layered features, as seen by HiRISE under HiWish program
    Layered features, as seen by HiRISE under HiWish program
  • Layers in crater wall, as seen by HiRISE under HiWish program
    Layers in crater wall, as seen by HiRISE under HiWish program
  • Layers, as seen by HiRISE under HiWish program
    Layers, as seen by HiRISE under HiWish program

Columnar jointing

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Lava flows sometimes cool to form large groups of more-or-less equally sized columns.[44][45] These joints have been seen on Mars.[46]


  • Wide view of crater that has columnar jointing that is visible in enlarged images that follow. Picture taken with HiRISE.
    Wide view of crater that has columnar jointing that is visible in enlarged images that follow. Picture taken with HiRISE.
  • Crater wall with columnar jointing in the location of the box. Columnar joints are easily seen in the enlarged image that follows. Picture taken with HiRISE.
    Crater wall with columnar jointing in the location of the box. Columnar joints are easily seen in the enlarged image that follows. Picture taken with HiRISE.
  • Close view of crater wall with columnar jointing labeled. Picture taken with HiRISE.
    Close view of crater wall with columnar jointing labeled. Picture taken with HiRISE.
  • Columnar jointing on Earth
    Columnar jointing on Earth
  • Columnar jointing on Earth
    Columnar jointing on Earth
  • Columnar Jointing in Yellowstone National Park
    Columnar Jointing in Yellowstone National Park

Other images

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  • Map of Mare Tyrrhenum quadrangle. Tyrrhenus Mons is a major volcano.
    Map of Mare Tyrrhenum quadrangle. Tyrrhenus Mons is a major volcano.
  • The Ausonia Montes in Mare Tyrrhenum as seen by CTX
    The Ausonia Montes in Mare Tyrrhenum as seen by CTX
  • Tyrrhenus Mons, as seen by HiRISE and suggested by Ehsan Sanaei's high school astronomy club in Yazd, Iran. Click on image to see excellent view of pit crater chains and concentric features around a volcano.
    Tyrrhenus Mons, as seen by HiRISE and suggested by Ehsan Sanaei's high school astronomy club in Yazd, Iran. Click on image to see excellent view of pit crater chains and concentric features around a volcano.
  • Wide view of ridges that are mostly curved. Picture taken with HiRISE under HiWish program.
    Wide view of ridges that are mostly curved. Picture taken with HiRISE under HiWish program.
  • Mostly curved ridges. Picture taken with HiRISE under HiWish program.
    Mostly curved ridges. Picture taken with HiRISE under HiWish program.
  • Ridges of different sizes, some indicated by arrows are straight. Picture taken with HiRISE under HiWish program.
    Ridges of different sizes, some indicated by arrows are straight. Picture taken with HiRISE under HiWish program.
  • Mostly curved ridges. Picture taken with HiRISE under HiWish program.
    Mostly curved ridges. Picture taken with HiRISE under HiWish program.
  • Ridges, some of which seem to have layers. Picture taken with HiRISE under HiWish program.
    Ridges, some of which seem to have layers. Picture taken with HiRISE under HiWish program.
  • Wide view of linear features, as seen by HiRISE under HiWish program
    Wide view of linear features, as seen by HiRISE under HiWish program
  • Close view of linear features, as seen by HiRISE under HiWish program
    Close view of linear features, as seen by HiRISE under HiWish program
  • Close, color view of linear features, as seen by HiRISE under HiWish program
    Close, color view of linear features, as seen by HiRISE under HiWish program
  • Landslide, as seen by HiRISE under HiWish program
    Landslide, as seen by HiRISE under HiWish program
  • Crater, as seen by HiRISE under HiWish program. The floor appears to have dropped some.
    Crater, as seen by HiRISE under HiWish program. The floor appears to have dropped some.
  • Ejecta lobes in a crater, as seen by HiRISE under HiWish program
    Ejecta lobes in a crater, as seen by HiRISE under HiWish program
  • Fractured crater floor, as seen by HiRISE under HiWish program
    Fractured crater floor, as seen by HiRISE under HiWish program

Other Mars quadrangles

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Mars Quad Map
Mars Quad Map
The image above contains clickable linksClickable image of the 30 cartographic quadrangles of Mars, defined by the USGS.[47][48] Quadrangle numbers (beginning with MC for "Mars Chart")[49] and names link to the corresponding articles. North is at the top; 0°N 180°W / 0°N 180°W / 0; -180 is at the far left on the equator. The map images were taken by the Mars Global Surveyor.
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Interactive Mars map

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Map of MarsAcheron FossaeAcidalia PlanitiaAlba MonsAmazonis PlanitiaAonia PlanitiaArabia TerraArcadia PlanitiaArgentea PlanumArgyre PlanitiaChryse PlanitiaClaritas FossaeCydonia MensaeDaedalia PlanumElysium MonsElysium PlanitiaGale craterHadriaca PateraHellas MontesHellas PlanitiaHesperia PlanumHolden craterIcaria PlanumIsidis PlanitiaJezero craterLomonosov craterLucus PlanumLycus SulciLyot craterLunae PlanumMalea PlanumMaraldi craterMareotis FossaeMareotis TempeMargaritifer TerraMie craterMilankovič craterNepenthes MensaeNereidum MontesNilosyrtis MensaeNoachis TerraOlympica FossaeOlympus MonsPlanum AustralePromethei TerraProtonilus MensaeSirenumSisyphi PlanumSolis PlanumSyria PlanumTantalus FossaeTempe TerraTerra CimmeriaTerra SabaeaTerra SirenumTharsis MontesTractus CatenaTyrrhena TerraUlysses PateraUranius PateraUtopia PlanitiaValles MarinerisVastitas BorealisXanthe Terra
The image above contains clickable linksInteractive image map of the global topography of Mars. Hover your mouse over the image to see the names of over 60 prominent geographic features, and click to link to them. Coloring of the base map indicates relative elevations, based on data from the Mars Orbiter Laser Altimeter on NASA's Mars Global Surveyor. Whites and browns indicate the highest elevations (+12 to +8 km); followed by pinks and reds (+8 to +3 km); yellow is 0 km; greens and blues are lower elevations (down to −8 km). Axes are latitude and longitude; Polar regions are noted.


See also

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References

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  1. ^ Davies, M.E.; Batson, R.M.; Wu, S.S.C. “Geodesy and Cartography” in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. Mars. University of Arizona Press: Tucson, 1992.
  2. ^ Hartmann, W. 2003. A Traveler's Guide to Mars. Workman Publishing. NY NY.
  3. ^ Carr, M. 2007. The surface of Mars. Cambridge University Press. New York. ISBN 978-0-521-87201-0
  4. ^ Skinner, J., L. Skinner, and J. Kargel. 2007. Re-assessment of Hydrovolcanism-based Resurfacing within the Galaxias Fossae Region of Mars. Lunar and Planetary Science XXXVIII (2007)
  5. ^ "HiRISE | Craters and Pit Crater Chains in Chryse Planitia (PSP_008641_2105)".
  6. ^ a b Wyrick, D., D. Ferrill, D. Sims, and S. Colton. 2003. Distribution, Morphology and Structural Associations of Martian Pit Crater Chains. Lunar and Planetary Science XXXIV (2003)
  7. ^ http://www.swri.edu/4org/d20/DEMPS/planetgeo/planetmars.html[permanent dead link]
  8. ^ "Mars Global Surveyor MOC2-620 Release".
  9. ^ Ferrill, D., D. Wyrick, A. Morris, D. Sims, and N. Franklin. 2004. Dilational fault slip and pit chain formation on Mars 14:10:4-12
  10. ^ "Stones, Wind, and Ice: A Guide to Martian Impact Craters".
  11. ^ "Indiana University Bloomington".
  12. ^ Cardinale, M., S. Silvestro, D. Vazd, T. Michaels, M. Bourke, G. Komatsu, L. Marinangeli. 2016. Present-day aeolian activity in Herschel Crater, Mars. Icarus: 265, 139-148.
  13. ^ Osinski, G., et al. 2013. Impact-generated hydrothermal systems on Earth and Mars. Icarus: 224, 347-363.
  14. ^ Carrozzo, F. et al. 2017. Geology and mineralogy of the Auki Crater, Tyrrhena Terra, Mars: A possible post impact-induced hydrothermal system. 281: 228-239
  15. ^ Loizeau, D. et al. 2012. Characterization of hydrated silicate-bearing outcrops in tyrrhena Terra, Mars: implications to the alteration history of Mars. Icarus: 219, 476-497.
  16. ^ Naumov, M. 2005. Principal features of impact-generated hydrothermal circulation systems: mineralogical and geochemical evidence. Geofluids: 5, 165-184.
  17. ^ Ehlmann, B., et al. 2011. Evidence for low-grade metamorphism, hydrothermal alteration, and diagenesis on Mars from phyllosilicate mineral assemblages. Clays Clay Miner: 59, 359-377.
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  24. ^ Baker, V., R. Strom, R., V. Gulick, J. Kargel, G. Komatsu, V. Kale. 1991. Ancient oceans, ice sheets and the hydrological cycle on Mars. Nature 352, 589–594.
  25. ^ Carr, M. 1979. Formation of Martian flood features by release of water from confined aquifers. J. Geophys. Res. 84, 2995–300.
  26. ^ Komar, P. 1979. Comparisons of the hydraulics of water flows in Martian outflow channels with flows of similar scale on Earth. Icarus 37, 156–181.
  27. ^ Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011.
  28. ^ Raeburn, P. 1998. Uncovering the Secrets of the Red Planet Mars. National Geographic Society. Washington D.C.
  29. ^ Moore, P. et al. 1990. The Atlas of the Solar System. Mitchell Beazley Publishers NY, NY.
  30. ^ Carr, M. 1979. Formation of martian flood features by release of water from confined aquifers. J. Geophys. Res. 84: 2995-3007.
  31. ^ Hanna, J. and R. Phillips. 2005. Tectonic pressurization of aquifers in the formation of Mangala and Athabasca Valles on Mars. LPSC XXXVI. Abstract 2261.
  32. ^ Head, J., J. Mustard. 2006. Breccia dikes and crater-related faults in impact craters on Mars: Erosion and exposure on the floor of a crater 75 km in diameter at the dichotomy boundary, Meteorit. Planet Science: 41, 1675-1690.
  33. ^ Mangold et al. 2007. Mineralogy of the Nili Fossae region with OMEGA/Mars Express data: 2. Aqueous alteration of the crust. J. Geophys. Res., 112, doi:10.1029/2006JE002835.
  34. ^ Mustard et al., 2007. Mineralogy of the Nili Fossae region with OMEGA/Mars Express data: 1. Ancient impact melt in the Isidis Basin and implications for the transition from the Noachian to Hesperian, J. Geophys. Res., 112.
  35. ^ Mustard et al., 2009. Composition, Morphology, and Stratigraphy of Noachian Crust around the Isidis Basin, J. Geophys. Res., 114, doi:10.1029/2009JE003349.
  36. ^ "HiRISE | Dunes and Inverted Craters in Arabia Terra (ESP_016459_1830)".
  37. ^ Michael H. Carr (2006). The surface of Mars. Cambridge University Press. ISBN 978-0-521-87201-0. Retrieved 21 March 2011.
  38. ^ "Sand Dunes - Phenomena of the Wind - DesertUSA".
  39. ^ Archived at Ghostarchive and the Wayback Machine: "Curiosity Rover Report (Dec. 15, 2015): First Visit to Martian Dunes". YouTube. 15 December 2015.
  40. ^ "The Flowing Sands of Mars". 9 May 2012.
  41. ^ Namowitz, S., Stone, D. 1975. earth science the world we live in. American Book Company. New York.
  42. ^ NASA.gov
  43. ^ "HiRISE | High Resolution Imaging Science Experiment". Hirise.lpl.arizona.edu?psp_008437_1750. Retrieved 2012-08-04.
  44. ^ "Columnar Jointing". 15 April 2010.
  45. ^ Bates, R. and J. Jackson (eds.) 1976. Dictionary of Geological Terms. Doubleday, New York.
  46. ^ McEwen, A. et al. 2017. Mars The Pristine Beauty of the Red Planet. University of Arizona Press. Tucson.
  47. ^ Morton, Oliver (2002). Mapping Mars: Science, Imagination, and the Birth of a World. New York: Picador USA. p. 98. ISBN 0-312-24551-3.
  48. ^ "Online Atlas of Mars". Ralphaeschliman.com. Retrieved December 16, 2012.
  49. ^ "PIA03467: The MGS MOC Wide Angle Map of Mars". Photojournal. NASA / Jet Propulsion Laboratory. February 16, 2002. Retrieved December 16, 2012.

Further reading

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  • Lorenz, R. 2014. The Dune Whisperers. The Planetary Report: 34, 1, 8-14
  • Lorenz, R., J. Zimbelman. 2014. Dune Worlds: How Windblown Sand Shapes Planetary Landscapes. Springer Praxis Books / Geophysical Sciences.
[edit]
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