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Noachis quadrangle

Coordinates: 47°30′S 330°00′W / 47.5°S 330°W / -47.5; -330
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Noachis quadrangle
Map of Noachis quadrangle from Mars Orbiter Laser Altimeter (MOLA) data. The highest elevations are red and the lowest are blue.
Coordinates47°30′S 330°00′W / 47.5°S 330°W / -47.5; -330
Image of the Noachis Quadrangle (MC-27). The northeast includes the western half of Hellas basin. The southeastern region contains Peneus Patera and part of the Amphitrites volcano.

The Noachis quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Noachis quadrangle is also referred to as MC-27 (Mars Chart-27).[1]

The Noachis quadrangle covers the area from 300° to 360° west longitude and 30° to 65° south latitude on Mars. It lies between the two giant impact basins on Mars: Argyre and Hellas. The Noachis quadrangle includes Noachis Terra and the western part of Hellas Planitia.

Noachis is so densely covered with impact craters that it is considered among the oldest landforms on Mars—hence the term "Noachian" for one of the earliest time periods in martian history. In addition, many previously buried craters are now coming to the surface,[2] where Noachis' extreme age has allowed ancient craters to be filled, and once again newly exposed.

Much of the surface in Noachis quadrangle shows a scalloped topography where the disappearance of ground ice has left depressions.[3]

The first piece of human technology to land on Mars landed (crashed) in the Noachis quadrangle. The Soviet's Mars 2 crashed at 44°12′S 313°12′W / 44.2°S 313.2°W / -44.2; -313.2. It weighed about one ton. The automated craft attempted to land in a giant dust storm. To make conditions even worse, this area also has many dust devils.[4]

Scalloped topography

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Scalloped Terrain at Peneus Patera, as seen by HiRISE. Scalloped terrain is quite common in some areas of Mars.

Certain regions of Mars display scalloped-shaped depressions. The depressions are believed to be the remains of an ice-rich mantle deposit. Scallops are created when ice sublimates from frozen soil.[5][6] This mantle material probably fell from the air as ice formed on dust when the climate was different due to changes in the tilt of the Mars pole.[7] The scallops are typically tens of meters deep and from a few hundred to a few thousand meters across. They can be almost circular or elongated. Some appear to have coalesced, thereby causing a large heavily pitted terrain to form. A study published in Icarus, found that the landforms of scalloped topography can be made by the subsurface loss of water ice by sublimation under current Martian climate conditions. Their model predicts similar shapes when the ground has large amounts of pure ice, up to many tens of meters in depth.[8] The process of producing the terrain may begin with sublimation from a crack because there are often polygon cracks where scallops form.[3]

  • Scalloped topography, as seen by HiRISE
    Scalloped topography, as seen by HiRISE
  • Close view of scalloped topography, as seen by HiRISE
    Close view of scalloped topography, as seen by HiRISE
  • Scalloped topography, as seen by HiRISE under HiWish program. Dust devil tracks are also visible.
    Scalloped topography, as seen by HiRISE under HiWish program. Dust devil tracks are also visible.
  • Scalloped topography, as seen by HiRISE under HiWish program
    Scalloped topography, as seen by HiRISE under HiWish program

Dust devil tracks

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Main article: Dust devil tracks

Many areas on Mars experience the passage of giant dust devils. A thin coating of fine bright dust covers most of the Martian surface. When a dust devil goes by it blows away the coating and exposes the underlying dark surface creating tracks. Dust devils have been seen from the ground and from orbit. They have even blown the dust off of the solar panels of the two Rovers on Mars, thereby greatly extending their lives.[9] The twin Rovers were designed to last for three months, instead they have lasted more than six years and are still going after over eight years. The pattern of the tracks have been shown to change every few months.[10] TA study that combined data from the High Resolution Stereo Camera (HRSC) and the Mars Orbiter Camera (MOC) found that some large dust devils on Mars have a diameter of 700 meters and last at least 26 minutes.[11] Some dust devils are taller than the average tornado on Earth.[12] The image below of Russel Crater shows changes in dust devil tracks over a period of only three months, as documented by HiRISE. Other dust devil tracks are visible in the picture of Frento Vallis.

Craters

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Impact craters generally have a rim with ejecta around them, in contrast volcanic craters usually do not have a rim or ejecta deposits. As craters get larger (greater than 10 km in diameter) they usually have a central peak.[13] The peak is caused by a rebound of the crater floor following the impact.[14] Sometimes craters will display layers. Craters can show us what lies deep under the surface.

  • Maunder Crater, as seen by HiRISE. The overhang is part of the degraded south (toward bottom) wall of crater. The scale bar is 500 meters long.
    Maunder Crater, as seen by HiRISE. The overhang is part of the degraded south (toward bottom) wall of crater. The scale bar is 500 meters long.
  • Asimov Crater, as seen by HiRISE. Bottom of picture shows southeastern wall of crater. Top of picture is edge of mound that fills most of the crater.
    Asimov Crater, as seen by HiRISE. Bottom of picture shows southeastern wall of crater. Top of picture is edge of mound that fills most of the crater.
  • Layers in west slope of Asimov Crater, as seen by HiRISE.
    Layers in west slope of Asimov Crater, as seen by HiRISE.
  • Close-up of layers in west slope of Asimov Crater. Shadows show the overhang. Some of the layers are much more resistant to erosion, so they stick out. Image from HiRISE.
    Close-up of layers in west slope of Asimov Crater. Shadows show the overhang. Some of the layers are much more resistant to erosion, so they stick out. Image from HiRISE.
  • East Slope of Central Pit in Asimov Crater, as seen by HiRISE. Click on image to see more details of the many gullies.
    East Slope of Central Pit in Asimov Crater, as seen by HiRISE. Click on image to see more details of the many gullies.
  • Kaiser Crater (large crater in upper part of image) context for THEMIS image
    Kaiser Crater (large crater in upper part of image) context for THEMIS image
  • Detail of south wall of Kaiser Crater, as seen by THEMIS. Top of image shows part of a dune field.
    Detail of south wall of Kaiser Crater, as seen by THEMIS. Top of image shows part of a dune field.
  • Rabe Crater Floor, as seen by HiRISE. Click on image to see layers. Dark sand that made the dunes was probably blown in from elsewhere.
    Rabe Crater Floor, as seen by HiRISE. Click on image to see layers. Dark sand that made the dunes was probably blown in from elsewhere.
  • Crater that was buried in another age and is now being exposed by erosion, as seen by the Mars Global Surveyor, under the MOC Public Targeting Program
    Crater that was buried in another age and is now being exposed by erosion, as seen by the Mars Global Surveyor, under the MOC Public Targeting Program
  • Floor of crater in Noachis quadrangle, as seen by HiRISE under HiWish program
    Floor of crater in Noachis quadrangle, as seen by HiRISE under HiWish program
  • Erosion forms on floor of crater, as seen by HiRISE under HiWish program
    Erosion forms on floor of crater, as seen by HiRISE under HiWish program
  • Le Verrier (Martian Crater), as seen by CTX camera (on Mars Reconnaissance Orbiter)
    Le Verrier (Martian Crater), as seen by CTX camera (on Mars Reconnaissance Orbiter)
  • Secondary craters, as seen by HiRISE under HiWish program These were made from material thrown in the air by primary impact of large body nearby.
    Secondary craters, as seen by HiRISE under HiWish program These were made from material thrown in the air by primary impact of large body nearby.

Sand dunes

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When there are perfect conditions for producing sand dunes, steady wind in one direction and just enough sand, a barchan sand dune forms. Barchans have a gentle slope on the wind side and a much steeper slope on the lee side where horns or a notch often forms.[15] One picture below shows a definite barchan.

  • Dark dunes (probably basalt), in an intracrater dune field, Noachis. Picture from Mars Global Surveyor, under the MOC Public Targeting Program.
    Dark dunes (probably basalt), in an intracrater dune field, Noachis. Picture from Mars Global Surveyor, under the MOC Public Targeting Program.
  • Wide view of dunes in Noachis, as seen by HiRISE
    Wide view of dunes in Noachis, as seen by HiRISE
  • Close-up view of dunes in previous image, as seen by HiRISE. Note how sand barely covers some boulders.
    Close-up view of dunes in previous image, as seen by HiRISE. Note how sand barely covers some boulders.
  • Barchan sand dunes in the Hellespontus region, as seen by HiRISE. The horns point in the downwind direction.
    Barchan sand dunes in the Hellespontus region, as seen by HiRISE. The horns point in the downwind direction.
  • Proctor Crater ripples and dunes, as seen by HiRISE
    Proctor Crater ripples and dunes, as seen by HiRISE
  • Wide view of a field of sand dunes, as seen by HiRISE under HiWish program
    Wide view of a field of sand dunes, as seen by HiRISE under HiWish program
  • Close view of sand dunes, as seen by HiRISE under HiWish program. A birchen dune is labeled.
    Close view of sand dunes, as seen by HiRISE under HiWish program. A birchen dune is labeled.
  • Close view of sand dunes, as seen by HiRISE under HiWish program
    Close view of sand dunes, as seen by HiRISE under HiWish program
  • Close view of sand dunes, as seen by HiRISE under HiWish program. A birchen dune is labeled.
    Close view of sand dunes, as seen by HiRISE under HiWish program. A birchen dune is labeled.
  • Close, color view of sand dunes, as seen by HiRISE under HiWish program
    Close, color view of sand dunes, as seen by HiRISE under HiWish program
  • Close, color view of dome sand dunes, as seen by HiRISE under HiWish program
    Close, color view of dome sand dunes, as seen by HiRISE under HiWish program

Gullies

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Main article: Gullies on Mars

Gullies on steep slopes are found in certain regions of Mars. Many ideas have been advanced to explain them. Formation by running water when the climate was different is a popular idea. Recently, because changes in gullies have been seen since HiRISE has been orbiting Mars, it is thought that they may be formed by chunks of dry ice moving down slope during spring time. Gullies are one of the most interesting discoveries made by orbiting space craft.[16][17][18][19]

  • Gullies on the wall of a crater, as seen by HiRISE under HiWish program
    Gullies on the wall of a crater, as seen by HiRISE under HiWish program
  • Gullies on mound in Asimov Crater, as seen by HiRISE
    Gullies on mound in Asimov Crater, as seen by HiRISE
  • Wide view of gullies and ridges in crater, as seen by HiRISE under HiWish program
    Wide view of gullies and ridges in crater, as seen by HiRISE under HiWish program
  • Close view of gully channels, as seen by HiRISE under HiWish program. Channels make some tight curves.
    Close view of gully channels, as seen by HiRISE under HiWish program. Channels make some tight curves.
  • Close view of gully channels, as seen by HiRISE under HiWish program. Arrows point to small channel within larger channels.
    Close view of gully channels, as seen by HiRISE under HiWish program. Arrows point to small channel within larger channels.
  • Wide view of gullies, as seen by HiRISE under HiWish program
    Wide view of gullies, as seen by HiRISE under HiWish program
  • Close view of gullies, as seen by HiRISE under HiWish program. Channels show curves.
    Close view of gullies, as seen by HiRISE under HiWish program. Channels show curves.
  • Close view of gullies, as seen by HiRISE under HiWish program. Polygonal shapes are visible.
    Close view of gullies, as seen by HiRISE under HiWish program. Polygonal shapes are visible.
  • Crater with gullies, as seen by HiRISE under HiWish program
    Crater with gullies, as seen by HiRISE under HiWish program
  • Close view of gullies, as seen by HiRISE under HiWish program
    Close view of gullies, as seen by HiRISE under HiWish program
  • Gullies in crater, as seen by HiRISE under HiWish program
    Gullies in crater, as seen by HiRISE under HiWish program

Hellas floor features

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The Hellas floor contains some strange-looking features. One of these features is called "banded terrain."[20][21][22] This terrain has also been called "taffy pull" terrain, and it lies near honeycomb terrain, another strange surface.[23] Banded terrain is found in the north-western part of the Hellas basin. This section of the Hellas basin is the deepest. The banded-terrain deposit displays an alternation of narrow band shapes and inter-bands. The sinuous nature and relatively smooth surface texture suggesting a viscous flow origin. A study published in Planetary and Space Science found that this terrain was the youngest deposit of the interior of Hellas. They also suggest in the paper that banded terrain may have covered a larger area of the NW interior of Hellas. The bands can be classified as linear, concentric, or lobate. Bands are typically 3–15 km long, 3 km wide. Narrow inter-band depressions are 65 m wide and 10 m deep.[24] Pictures of these features can look like abstract art.

  • Wide view of part of the floor of the Hellas basin, as seen by CTX
    Wide view of part of the floor of the Hellas basin, as seen by CTX
  • Wide view of Hellas basin floor, as seen by CTX. This is a slight enlargement of the previous image. The box shows the location of the next image that was taken with HiRISE.
    Wide view of Hellas basin floor, as seen by CTX. This is a slight enlargement of the previous image. The box shows the location of the next image that was taken with HiRISE.
  • Close-up of banded terrain on the floor of the Hellas basin, as seen by HiRISE. Other, previous photos show wide views of this region.
    Close-up of banded terrain on the floor of the Hellas basin, as seen by HiRISE. Other, previous photos show wide views of this region.
  • Twisted Terrain in Hellas Planitia, but actually located in Noachis quadrangle. Image taken with HiRISE.
    Twisted Terrain in Hellas Planitia, but actually located in Noachis quadrangle. Image taken with HiRISE.
  • Layered features on floor of Hellas Planitia, as seen by HiRISE under HiWish program This may be an example of honeycomb terrain that is not yet completely understood.
    Layered features on floor of Hellas Planitia, as seen by HiRISE under HiWish program This may be an example of honeycomb terrain that is not yet completely understood.
  • Twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program
    Twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program
  • Twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program. These twisted bands are also called "taffy pull" terrain.
    Twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program. These twisted bands are also called "taffy pull" terrain.
  • Wide view of twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program
    Wide view of twisted bands on the floor of Hellas Planitia, as seen by HiRISE under HiWish program
  • Close view of ridges in twisted bands, as seen by HiRISE under HiWish program
    Close view of ridges in twisted bands, as seen by HiRISE under HiWish program
  • Floor features in Hellas Planitia, as seen by HiRISE under HiWish program
    Floor features in Hellas Planitia, as seen by HiRISE under HiWish program
  • Floor features in Hellas Planitia, as seen by HiRISE under HiWish program
    Floor features in Hellas Planitia, as seen by HiRISE under HiWish program
  • Banded terrain, as seen by HiRISE under HiWish program
    Banded terrain, as seen by HiRISE under HiWish program

Gullies on dunes

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Gullies are found on some dunes. These are somewhat different from gullies in other places, like the walls of craters. Gullies on dunes seem to keep the same width for a long distance and often just end with a pit, instead of an apron. Many of these gullies are found on dunes in Russell (Martian crater).

  • Wide view of dunes in Russell Crater, as seen by HiRISE. Many narrow gullies are visible.
    Wide view of dunes in Russell Crater, as seen by HiRISE. Many narrow gullies are visible.
  • Close view of the end of gullies in Russell Crater, as seen by HiRISE. Note: These type of gullies do not usually end with an apron.
    Close view of the end of gullies in Russell Crater, as seen by HiRISE. Note: These type of gullies do not usually end with an apron.
  • Close view of the end of gullies in Russell Crater, as seen by HiRISE
    Close view of the end of gullies in Russell Crater, as seen by HiRISE
  • Close, color view of the end of gullies in Russell Crater, as seen by HiRISE
    Close, color view of the end of gullies in Russell Crater, as seen by HiRISE

Channels

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  • Channels, as seen by HiRISE under HiWish program
    Channels, as seen by HiRISE under HiWish program
  • Channel, as seen by HiRISE under HiWish program
    Channel, as seen by HiRISE under HiWish program

Other scenes

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  • Quadrangle map of Noachis labeled with major features
    Quadrangle map of Noachis labeled with major features
  • Dissected mantle with layers, as seen by HiRISE
    Dissected mantle with layers, as seen by HiRISE
  • Layers in depression in crater, as seen by HiRISE under HiWish program
    Layers in depression in crater, as seen by HiRISE under HiWish program
  • Wide view of ridges, as seen by HiRISE under HiWish program
    Wide view of ridges, as seen by HiRISE under HiWish program
  • Close view of hollows, as seen by HiRISE under HiWish program. Note: this is an enlargement of the previous image.
    Close view of hollows, as seen by HiRISE under HiWish program. Note: this is an enlargement of the previous image.
  • Ridges, as seen by HiRISE under HiWish program. Note: this is an enlargement of the previous image.
    Ridges, as seen by HiRISE under HiWish program. Note: this is an enlargement of the previous image.
  • High center polygons, as seen by HiRISE under HiWish program. Boxes are drawn around two individual polygons.
    High center polygons, as seen by HiRISE under HiWish program. Boxes are drawn around two individual polygons.
  • Wide view of mounds and brain terrain, as seen by HiRISE under HiWish program
    Wide view of mounds and brain terrain, as seen by HiRISE under HiWish program
  • Close view of mounds and brain terrain, as seen by HiRISE under HiWish program
    Close view of mounds and brain terrain, as seen by HiRISE under HiWish program
  • Light-toned material, as seen by HiRISE under HiWish program. Light-toned material is often associated with minerals that formed in water.
    Light-toned material, as seen by HiRISE under HiWish program. Light-toned material is often associated with minerals that formed in water.
  • Close view of surface, showing boulders and light-toned material, as seen by HiRISE under HiWish program
    Close view of surface, showing boulders and light-toned material, as seen by HiRISE under HiWish program
  • Flow, as seen by HiRISE under HiWish program
    Flow, as seen by HiRISE under HiWish program
  • Wide view showing flows and ridges, as seen by HiRISE under HiWish program
    Wide view showing flows and ridges, as seen by HiRISE under HiWish program
  • Close view of ridges, as seen by HiRISE under HiWish program
    Close view of ridges, 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.[25][26] Quadrangle numbers (beginning with MC for "Mars Chart")[27] 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.
(
)

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. ^ Mars Space Flight Facility (17 March 2004). "Exhumed Crater (Released 17 March 2004)". Arizona State University. Archived from the original on 27 September 2011. Retrieved 19 December 2011.
  3. ^ a b Lefort, A.; et al. (2010). "Scalloped terrains in the Peneus and Amphitrites Paterae region of Mars as observed by HiRISE". Icarus. 205 (1): 259–268. Bibcode:2010Icar..205..259L. doi:10.1016/j.icarus.2009.06.005.
  4. ^ Hartmann, W. 2003. A Traveler's Guide to Mars. Workman Publishing. NY, NY.[page needed]
  5. ^ "HiRISE | Scalloped Depressions in Peneus Patera (PSP_004340_1235)".
  6. ^ McEwen, A., et al. 2017. Mars The Pristine Beauty of the Red Planet. University of Arizona Press. Tucson.[page needed]
  7. ^ Head, James W.; Mustard, John F.; Kreslavsky, Mikhail A.; Milliken, Ralph E.; Marchant, David R. (2003). "Recent ice ages on Mars". Nature. 426 (6968): 797–802. Bibcode:2003Natur.426..797H. doi:10.1038/nature02114. PMID 14685228. S2CID 2355534.
  8. ^ Dundas, Colin M.; Byrne, Shane; McEwen, Alfred S. (2015). "Modeling the development of martian sublimation thermokarst landforms". Icarus. 262: 154–169. Bibcode:2015Icar..262..154D. doi:10.1016/j.icarus.2015.07.033.
  9. ^ "Press Release Images: Spirit". National Aeronautics and Space Administration. 12 April 2007. Retrieved 19 December 2011.
  10. ^ "Ken Edgett". National Aeronautics and Space Administration. 2001. Archived from the original on October 28, 2011. Retrieved 19 December 2011.
  11. ^ Reiss, D.; Zanetti, M.; Neukum, G. (2011). "Multitemporal observations of identical active dust devils on Mars with the High Resolution Stereo Camera (HRSC) and Mars Orbiter Camera (MOC)". Icarus. 215 (1): 358–369. Bibcode:2011Icar..215..358R. doi:10.1016/j.icarus.2011.06.011.
  12. ^ "How tall is a tornado?". 23 February 2023.
  13. ^ "Stones, Wind, and Ice: A Guide to Martian Impact Craters".
  14. ^ Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011.
  15. ^ Pye, Kenneth; Haim Tsoar (2008). Aeolian Sand and Sand Dunes. Springer. p. 138. ISBN 9783540859109.
  16. ^ "NASA Spacecraft Observes Further Evidence of Dry Ice Gullies on Mars". Jet Propulsion Laboratory.
  17. ^ "HiRISE | Activity in Martian Gullies (ESP_032078_1420)".
  18. ^ "Gullies on Mars Carved by Dry Ice, Not Water". Space.com. 16 July 2014.
  19. ^ "Frosty Gullies on Mars - SpaceRef".
  20. ^ Diot, X., et al. 2014. The geomorphology and morphometry of the banded terrain in Hellas basin, Mars. Planetary and Space Science: 101, 118-134.
  21. ^ "NASA - Banded Terrain in Hellas".
  22. ^ "HiRISE | Complex Banded Terrain in Hellas Planitia (ESP_016154_1420)".
  23. ^ Bernhardt, H., et al. 2018. THE BANDED TERRAIN ON THE HELLAS BASIN FLOOR, MARS: GRAVITY-DRIVEN FLOW NOT SUPPORTED BY NEW OBSERVATIONS. 49th Lunar and Planetary Science Conference 2018 (LPI Contrib. No. 2083). 1143.pdf
  24. ^ Diot, X.; El-Maarry, M.R.; Schlunegger, F.; Norton, K.P.; Thomas, N.; Grindrod, P.M.; Chojnacki, M. (2016). "Complex geomorphologic assemblage of terrains in association with the banded terrain in Hellas basin, Mars" (PDF). Planetary and Space Science. 121: 36–52. Bibcode:2016P&SS..121...36D. doi:10.1016/j.pss.2015.12.003.
  25. ^ Morton, Oliver (2002). Mapping Mars: Science, Imagination, and the Birth of a World. New York: Picador USA. p. 98. ISBN 0-312-24551-3.
  26. ^ "Online Atlas of Mars". Ralphaeschliman.com. Retrieved December 16, 2012.
  27. ^ "PIA03467: The MGS MOC Wide Angle Map of Mars". Photojournal. NASA / Jet Propulsion Laboratory. February 16, 2002. Retrieved December 16, 2012.
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